I am facing the same problems with power jumps as well as nightmares with the TX audio level, mainly after the latest windows "update". I am using W10  17763.678  , WSJTX 32 bits 2.1 , connected to an IC-7300 via USB.   
One month ago, with 2.0 and after the W10 "updates", all was running smooth  .
In addition,  W10  and LG-Gram laptop, changes the audio setting if I connect the headphones !!...  
For crying out loud !!  :-(