RE: Need opinions on what could be wrong
No, I dont have a servo tester. The receiver work well in my gas boats so I dont think it would be the reciever.
I got a reply on another site from a fellow hobbiest and the same thing happened to him. His esc's went faulty and did the same thing. He sent them back and they repaired them for him. I spoke to Michelle from hifei who told me to send the esc back to them and they will check them out for me.
I will send them back tomorrow if I get a chance.
Peter