AMS Lite Rotary Spool Holder 4 not retracting

Sorry to start this thread again but I’ve now had another spool holder fail. I took the last one apart and couldn’t see any obvious issues so I bought a new one as suggested and works perfectly. So I suppose my question is, do the spool holders need any maintenance like a little greasing every so often because I can’t see any reason as to why these have failed… many thanks