I think what you may be seeing is temperature creep. If you are taking the heli out of a hot car or out of the house when it is cold outside give it about 5 minutes to adjust to the outside temp then reset the gryo. This is a issue with the telebee I fought with a long time ago and pretty common to forget about during the summer and have to learn again with the temp changes. Depending on where your flying at that is. From inside in the AC to outside in the head could also be a problem.