W52P drops call after 38.25 minutes

[tas7330]

  25.50.0.20_12_3_29.pcap (Size: 2.16 MB / Downloads: 30) Hell Forum,

Yealink W52P - Firmware 25.50.0.20
Router - NetgearDGND3700V2 and Netgear WNDR4300
Voip Provider - byo.engin.com.au

I have a W52P that drops calls both incoming and outgoing after 38 minutes and 25 seconds. I have tested the W52P on two router with the same result. I've changed several account settings on the w52p without any success. Also tested the voip service using an cisco spa112 ata and anologue phone with no issues. SIP ALG is disabled in the router. I'm not familiar with wireshark captures but have captured the last 2 minutes of the call using the W52P pcap feature. There is a BYE request that is initiated when the call is dropped. It looks as if the call is not terminated but ended by request.
Can anyone shine some light on the problem as I'm a little lost?