I didn't have a problem with Spektrum in my m11 until I started running Tekins. I had glitching issues and the cogging like someone else said. The issues didn't happen all the time. They were sporatic. I would have problems with my buggy and my other cars would be fine. The next time, my truck would have the problem and the buggy was fine. I switched to the FHSS-2 Airtronics modules and receivers and it has worked perfectly.