We have a site with an iPX500 - MCP iPX2 that the time displayed on the phone drifts. This occurs over several days and ends up stabilizing at about 5 minutes slow. It does not go more than 5 minutes. We have attempted to offset this in Admin, Time Adj, seconds per day. This does not work. We changed out the MCP iPX2 processor thinking the time base in on the processor card - customer reporting same issue now a month later. Any help appreciated.