Phd2 error messages

I have a CGX mount that works perfectly.  I use a 60mm guide scope with an ASI129MM camera.  Some directions I point I get the message that RA isn't moving.  It says the old "check the cables or other obstructions".  I do check the cables and frequently recalibrate.  Still I get the message on my controller that RA isn't moving.  Usually I just move to another target and it works.  I am losing good targets because of this.  Ideas?  BTW, the mount was used and I got it on Cloudy Nights.
TKS