I would agree with this guy above me. I have had a similar issue occur from time to time when i take a few months off from the really fast soloing styles and spend time on thick chords and more slowhand playing styles. But like he said, if you just develop the muscles, and continue to train your hands to do what your head cant quite see yet you'll push through it. The other question I would have is are you having issues with your pick hand or fret hand primarily? This could be just me, but the pick hand seems to be very much the limiting factor when I start picking up speed, and if you have the same issue it is absolutely a matter of developing the muscles, and really reflex into the hand. Good luck!