So I’m riding along and all of a sudden, I can’t accelerate. Feels like the brakes are on and something smells like it’s burning. A friction rubber sort of smell. I pull over and wait a few minutes. Check brakes, no burning smell around any of the wheels. Roll trike back and forth, Rolls easily. Bike starts back up and runs normally. Happened twice now. 500 miles apart. Any idea what could cause bike to feel like brakes are holding it back from accelerating?