Spacecraft in Kerbin orbit randomly accelerate at fairly high rates

[DAL59]

I was assembling a spacecraft to go to Duna.  I already launched the command module, and I then launched a fuel module to dock with it.  Once in Kerbin orbit, I noticed some odd things.  Mechjeb's auto burn was not working at all.  I manually made a manuever node to rendevous.  When the bar turned green I pressed x as usual.  The delta vee read out continued to change at about 5 m/s^2!  I had to make constant course corrections, and but eventually, I made it to the command module.  It was then impossible to dock, as my spacecraft would randomly accelerate away from the module at 5 m/s^2 whenever I burned towards it, even when i shutdown the engine and disabled RCS.  This is not an orbital mechanics thing, I have docked hundreds of times and never seen anything like this at such a short distance, even at 100 meters I cannot rendevous.  I tried to switch to the command module, but it too began to randomly accelerate, though interestingly only after I started moving it.  In order to timewarp, I must press period several times, because I get "can't warp  under acceleration" over and over again.  Rotation also is wonky, even if mechjeb is off, and regardless of RCS.  At the same time this bug appeared, I also got a bug with commnet display, where no settings except "network" show anything, and "network" is a strobe light of green lines that constantly flash.    Quickloading does nothing.             \\

 

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Edited March 10, 2021 by DAL59

[Rambow_Ninja94]

If you use physical time warp the craft appear to get further away, but they stay the same distance apart.
Alternatively, your craft just has to many parts. High part counts sometimes glitch out really badly (try reducing part count).