Short Disconnect following permanent 250~ ping?

I'm having a quite annoying problem right now, and I would really appreciate some help. Sometimes I get a random disconnect (attempting to reconnect) for like 3 seconds, but after that my ping will stay at around 250ms so I'm forced to plug out my WLAN antenna and plug it in again, because it seems like the only way to fix the problem. Any idea what the problem could be? {{sticker:zombie-brand-mindblown}}
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