Throttle Issues?

[RuffMonk]

Well I thought that might be the issue at first, but when I'm not locked onto anything and just flying, it works perfectly, so it's not the controller. It also isn't a continuous occurrence, but it just seems to randomly happen from time to time. I'm even more baffled as to why it's just this week that I've started having issues with throttling down as I've never had any problems with it in the past?