I've had no problem with that. Suggest you check the chip socket and leads for
oil or dirt.
There is one thing that I do experience and that's a digital crackling in the
volume control, for example, if there is an open carrier and I change the
volume.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html