Motorola Droid 3 :: Wifi Drops After Update 5.7.906 On It?

We have 4 droid 3 phones here. The one I updated to 5.7.906 will now stop showing blue bars of wifi strength at the top of the screen after some time ( happens during inactivity but also during downloads ). The ones not updated ( 5.6.890 ) still continue to work flawlessly on wifi.In settings the updated phone still shows as connected to our network with bars of signal strength even though no bars highlighted are at the top of the screen.If I stop wifi on the phone and restart it it connects properly and gets the blue bars back at the top of screen and I can access the network. After some time though the blue bars will disapear and the phone will not be able to access the network ( even though in settings it will still show as connected with signal strength)I have checked battery saver options, gone through the process of forgetting settings on the phone and rebooting the router, removed all security from the router and done a factory reset of the phone ( which did not revert back to the old system version ). As the unupdated phones still work properly I am happy that the issues lies with the new update and as it still occurrs after a factory reset it suggests that the issue is not caused by a 3rd party app resident on the phone.Is there anyway I can undo the update on this phone so it will work properly again? Or is there any other way to get wifi working consistently again?