One more intersting thing: I restarted my 2 RPI's more or less 23 hours ago, with same MinePeon, cgminer, but distinct Arch Linux.

RPI 1 - version A (2011), 256 MBytes RAM, 13 USB Block erupters, [Linux minepeon 3.6.11-17-ARCH+ armv6l] - Uptime 4h 58s 32s

RPI 2 - version B (2012), 512 MBytes RAM, 12 USB Block erupters, [Linux minepeon 3.6.11-15-ARCH+ armv6l] - Uptime 23h 13s 0s

With the newer Arch Linux version, RPI 1 restarted at least 1 time. RPI 2, with older Arch Linux version, didn't restarted.