The cassette is disconnecting where it screws into the main body of the cleaner. Threads look good and I have tightened really tight but it still manages to disconnect itself. Maybe there is excessive vibration or something like that causing itself to unscrew itself?
The cleaner is in good shape so not sure where to go from here. I have attached a pic so you can see where it is unscrewing itself during operation.
Thanks for any advice.