I have an issue with how long it takes the 7206 (and the 605) to fail back over to the primary WAN when it comes back up.  Sometimes it seems to get 'stuck' on the backup connection which, in my case, is a limited cellular connection with a 20GB cap for data per month.  So, I don't want the router to stay 'failed over' any longer than necessary.  However, sometimes after the primary WAN comes back, the router refuses to switch back over to it.  What is the router doing to check the primary WAN, how often does it check and why isn't it returning back to the primary WAN connection when its back up?

Also, this issue could be avioded if the router would interact propery with Netgear's LM1200 cellular backup modem which takes a primary WAN connection and switches internally to cellular modem when it detects the WAN has went down.  I can't use it with either the 7206 or the 605 as they both refuse to accept the IP passthrough coming from the LM1200.  The LM1200 works fine with a Ubiquity EdgeMax Lite, but I'm trying to get away from Ubiquity stuff, but I'm finding a lot of holes here in the TP-Link routers.