Prevent re-boot when PPPoE connection restored after drop

Presently on my QNAP Qhora 322 if my primary PPPoE connection drops it happily fails over to my secondary WAN connection which uses DHCP, seamlessly without any disruption. However when the PPPoE connection is restored it immediately reboots the router causing a total loss of connectivity for up to 2 minutes.

Is there any way of stopping the reboot occurring so when my primary connection is restored I don’t get kicked out of any Webex/MS Teams meeting I’m in?