@d0ugmac1 I tried to remove the switch but I had ping problem about 700/800ms so I had to insert switch again. how can I check if there are some loops? thanks

@Tedd404 yes and I tried ping is perfect, when I get the problem I can't ping the ip and after few seconds everything starts working again

@Tedd404 thanks for the tips I think there's no problem with Poe, all the eap work properly Signal and interference idk if they could be the problem, how can I check it? Btw signal on my device is...

@d0ugmac1 That's what I've tried: - ISP - ER605 - OC 200 - SWITCH nothing works (WiFi device has no internet connection the same with LAN) then -ISP-ER605- 1 lan port to SWITCH and one to OC200- one...

@d0ugmac1 thanks for the questions OC200 and the router are new, I bought them new because of the problems, and didn't change nothing. 1. only 1 port (the left one), it is connected to the switch 2....

@d0ugmac1 the problem became bigger Sam Problem but most frequently I've found this, the problem is that I know it impossibile that a device connected via WiFi (full signal) in this point of the...