if you lose connection quite often there are a number of possible reasons
1/ your access point is flakey. try new firmware update - this can also interact with the power-saving on the tablet, very old APs don't allow clients to save power properly
2/ congestion - too many other people on the same channel. in 802.11b/g there's only three usable channels, 1, 6 and 11. some turbo high speed access points, especially early "N" routers, obliterate large parts of the wifi spectrum!
3/ interference - 2.4GHz cordless phones and some TV Video senders use the same band, and this can obliterate the entire wifi spectrum

if in doubt about your AP, try it at a different location, e.g. a friend's house.