Internet Speed Problem

[thedude23]

My internet up until last week was working fine, our modem is downstairs in my brothers room and he's connected via ethernet cable and I'm connected via Wifi upstairs on my pc. I know a wired connection will always have better speeds but up until last week I was getting 16mb and even sometimes 20, now I'm barely getting 3 if I'm lucky. It was working fine today and I was getting 13 mb all day and as soon as he turned on his pc it dropped to 3mb and I did a speedtest on his pc and he was getting 14mb where as I was only getting 1mb.

Any ideas what could be wrong?

Thanks

 

[thedude23]

I had the modem next to the computer on a table, I moved it because he kept knocking it off and I just moved it back on the table where his monitors are and boom I'm getting 13mb again.