I recently bought this router. It was working fine before. I was getting 70 Mb/s internet speed on both 2.4 GHz & 5 GHz. But suddenly 2.4 GHz started giving me 0.1 Mb/s speed even though I'm right...

Hi. I'm from Bangladesh. I'm trying to set the 2.4 ghz band on channel 13 but there's only option available from Channel 1-11. There's lots of interference on these channels in my area. Please...