diff --git a/revpimodio2/__init__.py b/revpimodio2/__init__.py
index 5963bbf..6773474 100644
--- a/revpimodio2/__init__.py
+++ b/revpimodio2/__init__.py
@@ -22,7 +22,7 @@ __author__ = "Sven Sager <akira@revpimodio.org>"
 __copyright__ = "Copyright (C) 2020 Sven Sager"
 __license__ = "LGPLv3"
 __name__ = "revpimodio2"
-__version__ = "2.5.8"
+__version__ = "2.5.8c"
 
 # Global package values
 OFF = 0
diff --git a/revpimodio2/helper.py b/revpimodio2/helper.py
index 1a72e1c..a202382 100644
--- a/revpimodio2/helper.py
+++ b/revpimodio2/helper.py
@@ -365,7 +365,7 @@ class ProcimgWriter(Thread):
     """
 
     __slots__ = "__dict_delay", "__eventth", "_eventqth", "__eventwork", \
-                "_adjwait", "_eventq", "_modio", \
+                "_eventq", "_modio", \
                 "_refresh", "_work", "daemon", "lck_refresh", "newdata"
 
     def __init__(self, parentmodio):
@@ -375,7 +375,6 @@ class ProcimgWriter(Thread):
         self.__eventth = Thread(target=self.__exec_th)
         self._eventqth = queue.Queue()
         self.__eventwork = False
-        self._adjwait = 0
         self._eventq = queue.Queue()
         self._modio = parentmodio
         self._refresh = 0.05
@@ -512,22 +511,22 @@ class ProcimgWriter(Thread):
     def run(self):
         """Startet die automatische Prozessabbildsynchronisierung."""
         fh = self._modio._create_myfh()
-        self._adjwait = self._refresh
 
+        mrk_delay = self._refresh
         mrk_warn = True
-        mrk_dt = default_timer()
-
         bytesbuff = bytearray(self._modio._length)
-        while not self._work.is_set():
-            ot = mrk_dt
 
-            # Lockobjekt holen und Fehler werfen, wenn nicht schnell genug
-            if not self.lck_refresh.acquire(timeout=self._adjwait):
+        while not self._work.is_set():
+            ot = default_timer()
+
+            # At this point, we slept and have the rest of delay from last cycle
+            if not self.lck_refresh.acquire(timeout=mrk_delay):
                 warnings.warn(
-                    "cycle time of {0} ms exceeded during executing function"
+                    "cycle time of {0} ms exceeded in your cycle function"
                     "".format(int(self._refresh * 1000)),
                     RuntimeWarning
                 )
+                mrk_delay = self._refresh
                 # Nur durch cycleloop erreichbar - keine verzögerten Events
                 continue
 
@@ -609,22 +608,18 @@ class ProcimgWriter(Thread):
                                     self._eventq.put(tup_fire, False)
                                 del self.__dict_delay[tup_fire]
 
-                # Sleep and not .wait (.wait uses system clock)
-                sleep(self._adjwait)
-
-            # Wartezeit anpassen um echte self._refresh zu erreichen
-            mrk_dt = default_timer()
-            if mrk_dt - ot >= self._refresh:
-                self._adjwait -= 0.001
-                if self._adjwait < 0:
-                    warnings.warn(
-                        "cycle time of {0} ms exceeded several times - can not"
-                        " hold cycle time!".format(int(self._refresh * 1000)),
-                        RuntimeWarning
-                    )
-                    self._adjwait = 0
+            mrk_delay = default_timer() % self._refresh
+            # Second default_timer call include calculation time from above
+            if default_timer() - ot > self._refresh:
+                warnings.warn(
+                    "cycle time of {0} ms exceeded - can not hold cycle time!"
+                    "".format(int(self._refresh * 1000)),
+                    RuntimeWarning
+                )
+                mrk_delay = 0.0
             else:
-                self._adjwait += 0.001
+                # Sleep and not .wait (.wait uses system clock)
+                sleep(self._refresh - mrk_delay)
 
         # Alle am Ende erneut aufwecken
         self._collect_events(False)
@@ -639,9 +634,7 @@ class ProcimgWriter(Thread):
         """Setzt die Zykluszeit in Millisekunden.
         @param value <class 'int'> Millisekunden"""
         if type(value) == int and 5 <= value <= 2000:
-            waitdiff = self._refresh - self._adjwait
             self._refresh = value / 1000
-            self._adjwait = 0 if waitdiff < 0 else self._refresh - waitdiff
         else:
             raise ValueError(
                 "refresh time must be 5 to 2000 milliseconds"
diff --git a/revpimodio2/modio.py b/revpimodio2/modio.py
index b81e3be..ea673ca 100644
--- a/revpimodio2/modio.py
+++ b/revpimodio2/modio.py
@@ -767,10 +767,10 @@ class RevPiModIO(object):
         # Zykluszeit übernehmen
         old_cycletime = self._imgwriter.refresh
         if not cycletime == self._imgwriter.refresh:
+            # Set new cycle time and wait one imgwriter cycle to sync fist cycle
             self._imgwriter.refresh = cycletime
-
-            # Zeitänderung in _imgwriter neuladen
             self._imgwriter.newdata.clear()
+            self._imgwriter.newdata.wait(self._imgwriter._refresh)
 
         # Benutzerevent
         self.exitsignal.clear()
@@ -781,6 +781,7 @@ class RevPiModIO(object):
         cycleinfo = helpermodule.Cycletools(self._imgwriter.refresh, self)
         e = None  # Exception
         ec = None  # Return value of cycle_function
+        self._imgwriter.newdata.clear()
         try:
             while ec is None and not cycleinfo.last:
                 # Auf neue Daten warten und nur ausführen wenn set()
diff --git a/setup.py b/setup.py
index 618a5d3..c8c704c 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ setup(
 
     license="LGPLv3",
     name="revpimodio2",
-    version="2.5.8",
+    version="2.5.8c",
 
     packages=["revpimodio2"],
     python_requires="~=3.2",