General Query - Backup Internet When Primary WAN Fails - Gaming / Keeping Connection Live?
 

So my query is simple I've just been doing some testing........  if the primary connection fails (I unhook it) and it falls back in my case to a 4G modem on the SPF port........  if I can keep a game online it fails to.

Is this just because of different IP's or routing?  I've got it set to 3 seconds response.  But even say if I plug the WAN back in, it's super slow to response when primary wan recovers.

Is there no way to keep things online?  

eg.  If I have multiple people in games for example web games or otherwise, how to have it seemlessly just switch with only a minor pause not a loss of connection?