Check your receiver pack. If the connector is compromised or if there's a broken battery bar on it you could run into issues. We test the daylights out of Spektrum equipment at huge 1/8-scale nitro tracks (All that's in this part of Illinois during the summer months) and have not had issues even at tracks like Lance Norrick's where the World's were held last year. I would also try rebinding to make sure the Guid codes are working properly too.