Solved! OpenVPN disconnects PIA on Asus N56U / Padavan firmware

[kmh]

I was having inactivity disconnects overnight, when OpenVPN client tried to reconnect I got

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Sun Jul 14 01:41:40 2019 AUTH: Received control message: AUTH_FAILED
Sun Jul 14 01:41:40 2019 SIGTERM[soft,auth-failure] received, process exiting

Full log on https://pastebin.com/Zq2G5S4C

This has something to do with PIA/OpenVPN using both password authentication and tokens.
Padavan's OpenVPN client implementation wasn't answering the expected way on reconnect.

A few nights of trial and error lead me to the

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auth-retry interact

command which solved the problem.
Posting this here to save some sleep for someone else.

My extended config is

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    persist-key
    persist-tun
    tls-client
    remote-cert-tls server
    resolv-retry infinite
    reneg-sec 0
    ping-timer-rem
    auth-retry interact