Your iPod Touch connection does not work if there is low or weak signal strength or do not have the latest firmware for your router. You need to verify that you are in range of signal and that you have the latest Wi-Fi router firmware. If it does not work, contact Apple iPod Touch customer support.
Yeah... It could be because of low wifi signal therefor disconnecting... If it isn't the case then try turning your device off and turning it back on.. And if it continues to have the problem then BACK UP first then Restore your device ..