Looking back at your past threads, I am having trouble following what servo amp control coniguration you are working on, but I have a torq-cut 30, which is just like the torq-cut 22 only longer in the X-axis, that was giving me sometimes sporadic, sometimes persistant problems with following errors and over current alarms on one of the axii.
Since I was lucky enough to have 3 identical amps on each of the X,Y and Z axis, I was able to swap the amp of offending axis with another and see the problem follow the bad amp. Once I determined that it was within the amp I bought a new one from BPT Parts. The funny thing is when I took the bad amp out I found a cold/burned solder joint on its circuit board where one of the screw terminals going out to the servo motor is connected. A little work with a soldering iron and it was working just fine. Now I have a spare amp on the shelf to get me out of my next jam.
You might want to check for a similar problem on your amp or at least rule out a physical/hardware issue.