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suggestion
From an mechanical maintenance view
Check your bearings in the end mounts
if they are angular contact type ( radial and thrust load ) then it may be a worn track ( in brgs ) if the drive shaft in not perfectly in line
or maybe incorrect preload
if they are deep groove brgs ( most common ) Replace the brgs
shaft deflection due to wear can also cause problems a deflection wedge can help
hope it may help a little
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