Do you have the receiver antenna wrapped around the struts or in contact with any other carbon fiber? It is best to CA a plastic stir stick or better yet r/c antenna tube to the struts and run the antenna through it. This is a common cause of glitching. Not all Blades experience it, but it is common. Another thing to look for is the wire not having good contact inside the 4-in-1. I had one completely fall out and had to resolder it.