[Elecraft] Operating PSK31 - Drift?

[KI7V (John)]

Hello,
 
I just built my SSB module for my K2 about two weeks ago.  All seems to work
well.  After building the SSB
Module, I decided give PSK31 a try.  Just built a couple of audio cables and
away it went - no problems.
When working another Station on PSK31, I've noticed that each time I stop
transmitting, I have to adjust
the VFO slightly up to Sync up the other stations signal.  I don't know if
my K2 is drifting or what.  The
Other stations that I've worked have commented on this as well and it
appears that it moves up about 60Hz
With each xmit/receive cycle.  Has anyone else noticed this?

Thanks,
 
73s,
John - KI7V
K2 #3706