I have a raspberry pi connected over wifi to my LAN. The LAN network on the router is a bridge of wifi and wired ethernet. When I ping raspberry from my PC connected to itself through wired LAN, everything is fine. But when I try to connect from my smartphone connected on the same wifi as the raspberry, first connection(ping) fails. When I try a few minutes later then it works for a while.
Has anyone an idea where the problem may be?