If you experience the "prop pitch bug" in the 109E4

[IvanK]

"Also, it might have something to do with the way you control the prop pitch on 109. In my opinion, the usual wheel axis (0-100) on a joystick is not very suitable and I prefer my HAT (returns to the neutral center position like the real thing), that might cause some issues, too. "

Good point. Make sure you dont have a conflicting AXIS command with a push button command. A while a go I had both an axis setting for prop pitch and a couple of buttons set.
In my case the axis was the rotary on the CH fighter Stick. Unless this was left in the FULL FINE position I got weird effects. Deleting this axis assignment and all is well.

I still get the E3 Prop pitch running to Coarse on spawn, but as others say a quick blip on the Fine HOTAS button stops the prop slewing further and returns it to correct control. Same occurs in the E4 if you select Manual on spawn.

On every start I select manual, set prop to 12:00
Take off in manual when RPM gets to 2300 select AUTO (E4)