I am running mine on 49 port hub, 10 port siopar 2.1a per port. when they start all good. then next day they all stop. I am using raspberry pi, and uddo machine. it happens on both.. So that might be issues that you are talking about can't go 24 hours without all stopping. was running them at 250mhz with powered 100v fan.
Not sure what to do to fix this.
I have not had any issues with these new-pacs but I have never ran them longer than 6 hours because my standard procedure is to use a script to restart cgminer every couple of hours.
Here is a similar code to what I use, but written for your Raspberry Pi. You still have to edit it slightly to fit your particulars.
Save this code as mine.sh, edit the line starting with lxterminal with the full path to your cgminer folder and then put in the commands you usually use for your pool, mark as an executing program and run. It goes in a loop so to exit, just use control C.
#!/bin/sh
echo "Restarting cgminer every 6 hours"
while true
do
lxterminal -e "/home/USERNAME/cgminer/cgminer -o POOL_URL -u USER -p PW --suggest-diff 128"
sleep 21600
pkill -f cgminer
echo "Restarting cgminer..."
sleep 4
done