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I didn't have the battery flat warnings so not sure we have the same problem.
I didn't solve mine as such, but I came to the conclusion that its most likely an indoor training only problem, due to all the interference from all the WiFi and Bluetooth and whatever else is going on in my block.
Back to your issue though, firmware update sounds like a good bet. I didn't realise the app was android only. Got a friend with android? If you're ever out South East way happy to help using mine. You need to register it first though
I am having similar problems with my NG eco, power drop outs, warnings the battery is nearly flat etc. power2max say it is a firmware issue and that I need to update firmware, however I don't have an android device.
What solutions have you found?