I rented a TNA last year for 3 months, returned it when the left scoop started holding onto balls indefinitely. It didn't seem to be the opto, but I gave it back before figuring it out. Fast forward to present, I picked up a TNA yesterday only to find out it was the EXACT machine I rented. It was briefly on location before I rented it. I'm now the 3rd owner at home, and I'm thinking at this point its going to be a good idea to go over the entire wiring harness and check every connection as I've noticed that being a major culprit of issues.
Glad to be here! Look for it on-stream in a week or so