SRR60 - On power outage after a reboot - Devices not able to connect the router

I have a SRR60 with 5 satalites and around 80 devices connected. I don't recall having this problem in the past, I believe it is related to one of the latest firmware updates I've done. 

Description of the problem - 

Recently in the area where I live, we have a short power outage, in this case the router reboots - when it's back up any device which was previously connected to the router - is getting time out connecting to the router or it's connected but the DHCP server is not assigning the network IP number. 

If I change the IP on my computer/phone to manually, and set up the network IP and DNS - the internet is working again on my device. 

The DHCP will start working only after something like a day ..... 

Steps I've tried to do - 

1) I've tried to lower the TTL to 1 hour - it did not help. 

2) I've tried to assigned manual IP by using MAC address - but it also did not work, seems like the router is not respecting this rule. and keep assigning IP the way he wants.