MacAir and network issues

i’m new mac’s, bought wife macair 13’ christmas going school.
great system, works great until tries upload youtube. first time file went great, next time slow, , after take 2 3 hr upload video (same size). went visit dad , able connect network , able upload files, worked great, second time not , after have taken hours. different location , network, same above.
downloads have started doing same, receiving updates , on ipad 1. ipad 2 works great same settings hers.

have 2 pc, 1 desk top , other laptop (wireless connection) can upload , download files ok, have checked router , connected macair ethernet cable, still same issues.

need suggestions or check now.

have deleted network locations , created new home connection, changed wireless settings @ router available , tested same results. have not changed dns ip’s. ( latest news google don’t truest them anymore).

macair 13” os x 10.7.2( purchased christmas 2011)

thanks
ken

 

my sister noticed similar issue download speeds slowing down of sudden (when other pcs connected fine). unfortunately, haven't been able trace specific. perhaps there wi-fi card. have considered taking genius bar have them run diagnostics? @ least, rule out hardware issue.

 

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