2*RP-6 Chained to each other 1* K4, 4*K2, 3* T2C;
About 4 cm232 and using Sonance VE-1 Emitters only.
System is 2 years old (many upgrades along the way);
System workes fine; then all flashers come on at the same time and block system.
Unplugging P.S. to both RP-6 will fix it; or waiting for a random time from 10 minutes to 2 hours it will fix [email protected]?#?$
Anyone know what's going on???

check for cabling/connection problems between all CM232 blocks

isolate [unplug] each one to troubleshoot

try updating everything on the system, even if it says it doesn't need it.

Or at least tell us from the outset which forums you are posting in. It's maddening to see a thread in one forum, then see the same thread in another forum a day or two later with all different answers!

It's usually a RM-433 going bad

I've just had a similar problem.

4 x T2-Cs via RM-433 to an RP-6.
All IR Emitters flashing randomly.
It was fixed by unplugging & replugging the RM-433

Is this a fault that needs repairing or just a random gremlin I wonder?

I vote the rm433 also