Crystals are very reliable, and in this case the drift would
not be enough to take minutes to sync. It sounds a lot more
like a component that fails when too cold or uncharged.

Richard Thomas wrote:

I am wondering if the problem is that the crystal frequency has drifted
as it ages - I see from the parts list that the crystal is unusually
fine tolerance 30ppm:
CRYSTAL-SMD;24MHz,30ppm,28-ABX,16pF,50ohm

Anyone had similar experience with crystals / Samsung monitors / GM5020 IC?