It would be hard to blame or rule out the radio without using a data logger. I had my Cub snap roll on me the other day and I swore I must have had a hit. After landing, there were no frame errors or holds at all with the data logger. I was high when it happened and the winds were starting roll in so I think I just hit one of the vortices going a little slow on my nasty Cub. If you suspect your radio, get one of the flight data loggers.