Modem Storage Overload?

I did exactly what you are about to do. I purchased an Asus RT-AX88u router. It has improved my overall local area network but hasn't helped the TMO gateway problems of memory leaks & buggy firmware. I have extreme buffering while watching YouTube and had to go down in HD resolution in YouTube TV & Netflix to keep from resetting the gateway. Other issues I have is my gateway has 4 bars after 10pm at night but drops to 2 during the day bringing down my speeds from 300Mbps to 12Mbps. So during the day I have a slow internet connection and at night I have great service. I have decided to move back to Spectrum since they have 400Mbps at $60

Same deal, “Modem Storage Overload” message appears since FW 1609.

Not very often: once a couple of weeks.  The modem is connected to exactly one device (my router) over Ethernet, and the WiFi on the modem is disabled (all SSIDs are disabled).  When "Modem Storage Overload" happens, the admin connection to the modem stops working.  I can log into my router, and it shows "internet provider's DHCP is not working correctly".  I can not log in to the modem on 192.168.12.1.  Power-cycling the modem doesn't reset the message - but if you power-cycle and wait some 10 minutes, the thing starts working all of a sudden.

I was hoping 1609 would bring ipv6 pass-through, and instead we got this bullshit instead?  Come on TMob, you can do better than this!

The modem storage overload is caused by all of these spam SMS messages being sent to the gateway how do I block these from coming in?