NHTSA Complaint #11577969 — 2014 TOYOTA CAMRY

I have had a vibration at different points of speed that would stop when you let off the gas or accelerate more. It doesn't do it beyond 60mph. I've had my vehicle in the dealership twice. 1st they told me my rear brakes were siezed to the rotors. I changed brakes, rotors, and shims on all wheels. Still didn't resolve the issue. Went into the dealership a 2nd time. They told me it was the right rear wheel bearing. I replaced that and still didn't resolve the issue. If Toyota can't figure out what is wrong with it, then who would? I can't afford to keep paying for a wrong diagnoses. I feel like my car will break down or even get into an accident because of this. There are no warning lights triggered when the vibrations happen. Please help me.