Hello,
Have tryed two vpn apps one from privatevpn and ipvanish
Install going good, logging in with my account and password no problem there.
I connect to an vpn server to denmark going good about 30 min after that lost internet connection.
Have checked app is approved in security
Hope som have M5 Note use some of vpn provider and test.
Was first thinking was my wireless router but was not there.
Have another android phone from Xiaomi on that goes very good no problem.
Something in Flyme os stopping them to working after 30 min in my phone!!