I never had this problem but from reading the manual
Repetier-Host - Manual control tab - OK button
right -bottom corner (Debug Options)
The last button “ok” fakes a receiving ok from the printer. If your printer stalls, it may be simply because the firmware send an ok and only the o or k was received. In that case, hitting ok can restart the printing process.
As said i don’t know if it’s working because i never had the problem
but i remembered this part.
Please try it next time. And if it really works you should try to get bigger distance
between your USB cable and PSU