Hi guys,
I have a problem with one of my clients. When I connect him, the Tx/Rx Rate and Tx/Rx CCQ of other clients are getting much worse and the pings of other clients goes to hell.
When he is connected, he has this values at my Mikrotik:
Tx/Rx : 1Mbps-SP/54Mbps , Tx/Rx CCQ 20-30percent-> terrible, I know.
Here are the client registration data (marked):

At this moment, when I look at his Router-Client WA2204, I see this (HYPERION1):

When I disconnect him at his AP, everything is OK and the signal of other clients is from -60 to -70.
The strange thing is, that this only happens after sunset or when the weather is bad (snowing, raining…etc.). During the day is everything ok, he even goes 54Mbit/48Mbit and works best in the WLAN, other clients works as well.
I do not know what to do with this and where to look for possible problems. Is his AP damaged and transmits very weak signal?
Have you ever come to this problem? What is the possible issue?
My MikroTik RouterOS : V2.9
Client AP : WA2204A
Thanks for any reply
Tom