Does the wifi totally shut off, or does it switch to a different wifi source? If it is switching to a different wifi source, you might try any free wifi prioritizing Android app found in the Google Play store. Basically, you set the Phantom wifi as the prioritized one so your Android will only use that source whenever it detects the Phantom's wifi signal and won't switch off of it.
But if your wifi is completely turning off by itself (as in NO wifi connection at all), then I would say there is a problem with your Android as the device should not be able to just turn off wifi mode by itself. At least I've never heard of that happening under normal use.
But if your wifi is completely turning off by itself (as in NO wifi connection at all), then I would say there is a problem with your Android as the device should not be able to just turn off wifi mode by itself. At least I've never heard of that happening under normal use.