STS keeps shutting down during the day. I pulled out the cards, VM, Trunk, Trunk, expansion cabinet,one at a time, and then left the site for hours at a time. system kept shutting down. I replaced the KSU. System shut down again within 24 hours. System always comes back up within minutes. All programming is retained. So to be clear, I would pull one card and leave the site. Customer would say system went down. I would return, replace the pulled card. Pull a different card, leave the site. System would go down. I then returned after KSU replacement and took power supply out of UPS and put it in a Name brand surge protector/ UPS, but only in the surge side.
