wireless drops after using it

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http://unix.stackexchange.com – Recently, I have installed Linux Mint 10 Julia. Everything worked from the beginning (even the external wifi dongle), but I discovered that the wifi connection gets lost after some time. To solve it, I have to disable networking and re-enable it. Does anybody know what the problem could be? Further details can be found below: iwconfig wlan0 wlan0 IEEE 802.11bgn ESSID:"myessid" Mode:Managed Frequency:2.412 GHz Access Point: 00:22:3F:91:15:89 Bit Rate=11 Mb/s Tx-Power=11 dBm Retry long limit:7 RTS thr=512 B Fragment thr=512 B Pow (HowTos)