Erstes Unterforum » RT1900AC doesn't always reconnect on reboot

HI,

I was an early adopter of the RT1900AC (got mine within 2 weeks of the North American launch), but since the very first day I got my RT1900AC router I've had one annoying problem, when the router reboots it doesn't always reconnect to the Internet. I would say on average it's about 50% of the time it will connect. I've gone back and forth with Synology tech support for a long time with no resolution on this. But I wanted to post my experiences here mostly so others with the same problem can sound off, although if anyone has a suggestion please let me know.As I said, the problem is simple, when the router reboots (or powers on after a power loss), only about half the time will it acquire an IP address. If it fails to acquire an IP address, it doesn't matter how long you wait it will never reconnect on it's own, manual intervention is required. Sometimes rebooting the router several times will work, sometimes you need to power cycle the cable modem and router for it to work, and sometimes merely disconnecting the network cable between the cable modem and the router is enough.
What's annoying is I know the problem is the RT1900AC, but I can't seem to convince Synology of that, or their devs have been unable to find the problem using their diagnostic tools. Here is a list of the things I've tried, none of which have fixed the problem. Applied the latest firmware. I have factory reset the router. I have tried new cables. I have purchased a new cable modem. If I connect my laptop computer directly to the cable modem and reboot my laptop, it connects to the Internet 100% of the time. But rebooting the RT1900AC it reconnects about half the time. Also, this isn't just me. A family member in another town also has an RT1900AC with the exact same problem. So it's not the ISP, it's not the cable modem, nor the cables. It can only be the RT1900AC. Honestly I'm half tempted to find a way to use a program like wireshark to packet sniff the communication between the RT1900AC and my cable modem, because clearly Synology is not properly following that protocol. But I don't have time to do that right now.Has anyone else experienced this problem?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://forum.synology.com/enu/viewtopic.php?t=132549
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Thank you.