We need some info on this terrible problem, so Antiloop as well as number of other guys have reported, that fixing port speed fixes the problem.
So, the idea is to prove this finally.
Anyway, please try to fix port speed to 100full, 100half, 10full or 10half. Try to find one, which fix your problems.
Please note, that fixing port speed will slow down boot-up for the first time. This is due to the fact, that partner on the other side of the link will need to determine port speed and connection type by itself.
Also, it's possible, that link will never be established (possible reason for that is dumb device on the other side). Wait several minutes before claiming "it does not work".
Another option, pereviously reported on the forum is that wl500g does not boot with forced speed - just disconnect WAN port cable and power off/on unit. It's safe.
