Sounds like a psychological problem. Probably the best thing to do is to ignore it and just play through it and it will probably go away in time.

Sound a bit like "red-light syndrome" (which has nothing to do with hookers I might add) which is something I sometimes get when Im recording something. Imagine a piece that you know really well and have played a million times flawlessly. If I know Im going to be recording that particular take Im 10 times more likely to mess it up.

And sweating palms is 10 times better than sweating........ other bits !!!