I give up. The help has to come from Aliens. I appreciate all you have done for me. I ordered some .1 uF capacitors.My point was that if you installed the chips in sockets, you could add decoupling caps by inserting sockets with integral caps into the existing sockets. That would be a way to put a cap on every chip without requiring soldering.
If the problem persists after doing that, I'd focus on the clock coming from the minutes counter. I'd probably use a non-retriggerable one shot to stretch the pulse to see if that helps. If it does, the problem is identified and an acceptable solution can be pursued.