Welcome to HW. There are several of us regular members here with neurostimulators. We have all had different experiences -- mine has been nothing but good.
I have had a medtronics neurostimulator with leads attached to my infraorbital & supraorbital nerves in my face since July. Fortunately I had a smooth recovery from the surgery & have not had any problems with the actual device since it was implanted & I run my device 24/7. My reps have been great & really seem to know their stuff. I love my unit. That being said, unfortunately, there are bound to be bad units out there. Maybe you just happened to get one of them. Is it possible for them to replace the unit? I know that that means going through another surgery, but if it was helping significantly before it started malfunctioning, then it might be worth it.
Best of luck to you.