V83 and openvpn problem

[avayax]

I am running Yealink T23G and T42S phones connecting to my server via OpenVPN.
Everything works well with V82 but V83 has introduced an issue.

When on a call I have brief 2 seconds audio dropouts every 48 minutes.

This is what an excerpt from syslog on the phone whenever the audiodrop is happening:

Apparently there is a TSL soft reset happening.
This is only happening when live on a call, not when the phone is idle and causes the audio to drop on all phones I have tried it on. Never happens on V82.

29>Aug 25 13:40:44 openvpn[1352]: TLS: soft reset sec=-2861 bytes=67278407/67108864 pkts=284686/0
<29>Aug 25 13:40:44 openvpn[1352]: VERIFY OK: depth=1, CN=vpn-ca
<29>Aug 25 13:40:44 openvpn[1352]: VERIFY KU OK
<29>Aug 25 13:40:44 openvpn[1352]: Validating certificate extended key usage
<29>Aug 25 13:40:44 openvpn[1352]: ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
<29>Aug 25 13:40:44 openvpn[1352]: VERIFY EKU OK
<29>Aug 25 13:40:44 openvpn[1352]: VERIFY OK: depth=0, CN=vpnserver