How to treat multiwan on Asus rt-n16 or why gpon is such a crap?

Question

ASUS

Good day, comrades.
I live in Moscow. and I had 1 provider, onlime. it began to fail and I decided to try egg optics, a trendy gpon.
asus rt-n16 in the factory firmware can multiwan, both failover and load-balancing.
but gpon has taken it as a fashion to die once or twice a week for no reason. repaired only by sitting on the support line for half an hour and until they re-upload the config. reboots don't help.
but this raises a second problem.
since I set myself load-balancing, he then thinks that his gateway is available and tries to push traffic there, but he does not go further than the gpon of the router.
Accordingly, I just go to the settings of my asus and disable dual-wan.
it destroys the brains of the router. those. If I plug it in directly, there is traffic. if the cable remains in the router - dhcp receives correctly. but when trying to ping something other than the gateway - network unreachable.
routing labels are all correct. Pulling the cable or rebooting does not help. only factory reset saves it.
Of course, I saved the config, but even reloading it does not save, somewhere something remains in his brain.
do not offer to install ddwrt or openwrt. it has proprietary firewood for the chipset and it starts to bask in the custom like crazy. have any ideas?

Answer 1

familiar comrades say that this is the problem of a multivan in pieces of iron, so the balancing is built there. I recommend changing to Mikrotik. well then it's easier switch + net and vlana. and all.
but this doesn't answer the question.