On a Galaxy S6 with Android 6.0.1 I use OpenVPN Connect.
It works properly when the device is not in power saving mode. However when I turn the power saving on, the OpenVPN connection immediately becomes flaky. The client connects to the server, but after a few seconds it loses connection and tries to reconnect.
I have explicitly turned off OpenVPN Connect in "App power saving".
Is there anything I can do except for turning power saving mode off?