Leopard wifi problem

ok, this has been annoying me for a long time now... I have a PPC iMac G5 running 10.5.5. When I connect to my wifi network it works for a few minutes until I either download or upload a file larger than 500mb (like when I sync my apple tv). Then, the wifi signal drops down to 2 bars and stops working even though there are still 2 bars. I can't even ping my router. I know it's not a router problem because I don't have this problem if I am running Tiger. It only happens if I am running Leopard.

Any help would be greatly appreciated.

-Jordan

belvdr said:

I read somewhere on these forums that iMac's have issues with 10.5.5. Might want to search a bit to find that article.

EDIT:

See here:

https://forums.macrumors.com/threads/392852/

Click to expand...

Ya, I know about that problem, but my problem has been happening ever since 10.5.1 (when I got leopard)