I haven't seen any connectivity issues. I use OpenSSH and I scp large files with no problems. (I do run linux on the PC, though)
Maybe it's your router or access point dropping the connection. I use a Linksys WRTSL54GS running a third-party firmware ( v2.00.5, HyperWRT + thibor15b ) I highly reccommend this router and firmware to anyone looking to buy one.