I am using a ASA 5505 with two IPSec Tunnels & Remote users IPSec VPN's. I am finding that the unit locks up after about 2 days uptime. It remains visible locally so I can do an immediate system reload but there is no internet access, the tunnels gop down & the remote VPN users are unable to connect. After the system reload the unit is fine again until the next time. If I reload unit via ASDM it works for few minutes and locks again. But after power off/on it works for few days. Unit Version is 7.2(4).