It seems like my WiFi connection isn't so good, so I'm going to disconnect it once, and then reconnect.
"It seems like my WiFi connection isn't so good"=「私のWi-Fiの接続があまり良くないみたいです」(あるいは、"my WiFi connection doesn't seem to be very stable"=「あまり私のWi-Fiの接続が安定していないようです)
"so I'm going to disconnect it once"=「なので、一旦接続を切ります」
"and then reconnect"=「そして再接続します」