DOpus strange Systray exit

After installing 9.0.0.3 version I've experienced very strange DOpus behaviour. With previous versions DOpus was sitting on stand by in Systray forever or until I Exit it myself. Now, after around 20-25 min, it exits itself from systray, even if I'm doing something on open lister. It just disappear from the screen. I've checked Task Manager and dopus.exe is no there just dopusrt.exe is still running.
I've tried to reinstall it a couple of times with no success.
Can anyone tell me what's going on and help to fix it, please.

How odd. Possibly you have a corrupted installation - maybe a virus or something. Try re-downloading from the GPSoft website and doing a full reinstall. If you still have this problem after that, contact GPSoft directly for tech support.