First I tried to do a bridge with D-Link acces point. It worked, but it shoot down every other device using WLAN.
Zyxel has worked nicely. But it can't be reason for this, it is not always on. In a matter of fact is uses same power cord than my Commodore 64, Amstrad CPC, Sinclair ZX Spectrum, Atari etc. get their power.
68k Amigas are all in same power cord.