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1 year agoNot an app, but a device that will monitor power usage, like a kill a watt, is really handy for this sort of thing. You can tell right away if it is in a low power charging mode.
As others have said, the actual problem is probably a dirty port on your phone. The cable will wear out over time as well, so trying a different one may also help.
Try pivpn. It is meant to run on a raspberry pi, but it should work on most Ubuntu and Debian based distributions.