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Edited by bencebacsi at 2016-5-4 00:50 \n\n
On my UMI Touch all the GPS, WiFi and 3G/4G functions work perfectly stable, so we can lock out a possible software issue if you run the latest version on your phone or that would affect all devices.
Since I see that the groups of users with GPS, WiFi or 3G/4G connection issues are somewhat overlapped, all of these problems might be caused by the loose fixation of the antenna panel. I disassembled my phone and although I hadn't have any connection issues before, the screws of the antenna panel were not perfectly tightened. If those screws in your phone are more loose, that can cause connection problems together with high battery drain of the radio devices. So, such phones should be checked by a repairman.

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