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You probably have to login into your router or WIFI Access Point and look for error messsages.
If you want to use Wireshark to investigate you'll needs to capture the traffic at the WAN side of the router. How this can be done depends on your equipment. (For example, I have FttH and can use a managend switch to capture WAN traffic via a monitor port.)
However, you also mention it is used for gaming. In that case I recommend using a LAN-cable instead (and a gigabit switch). WIFI adds a significant latency to your connections, which is bad for online gaming.
You probably have to login into your router or WIFI Access Point and look for error messsages.
If you want to use Wireshark to investigate you'll needs to capture the traffic at the WAN side of the router. How this can be done depends on your equipment. (For example, I have FttH and can use a managend switch to capture WAN traffic via a monitor port.)
However, you also mention it is used for gaming. In that case I recommend using a LAN-cable instead (and a gigabit switch). WIFI adds a significant latency to your connections, which with is bad for online gaming.