Why does the IP address on BVI stop responding?

Question

Computer networks

Dear Colleagues, I've encountered a strange problem - the IP address on the BVI stopped responding. Until yesterday, everything worked like clockwork, and at one fine moment the IP of the BVI itself stopped responding. The bridge itself works great.
Configuration:
A bridge is assembled between two sub-interfaces, through which traffic from one of the providers goes. Inside is a white net (195.х.х.96). IP addresses assigned to servers from this subnet are accessible. However, BVI1's assigned IP address has not been pinged since yesterday.
After smoking all that is possible and using tambourines of different diameters, it was decided to rename the interface.
- I create group 2.
- I hang up on the interface an accessory to new group
- I create the BVI2 interface.
And oh gods - BVI2 started to respond. But the joy was not long - after 3 hours 26 minutes BVI2 stopped responding.
running config

interface GigabitEthernet0/0.795
 description ZAO_ITS_Internet
 encapsulation dot1Q 795
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip virtual-reassembly in
 no cdp enable
 bridge-group 2

interface GigabitEthernet0/2.795
 description Perimeter Network (DMZ)
 encapsulation dot1Q 795
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip virtual-reassembly in
 bridge-group 2

interface BVI2
 description ZAO_ITS_Internet_Bridge
 mtu 1514 
 ip address 195.ххх.ххх.110 255.255.255.240
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip nat outside
 ip virtual-reassembly in

bridge 2 protocol ieee
bridge 2 route ip

Why this happens and how to treat it - I do not know. Can anyone more experienced come across?
Let me remind you that before the failure, this IP address worked for more than six months (since the equipment was replaced) and the configuration did not change.

Answer 1

An obvious bug. It happens. Most likely, updating or rolling back will help.
Nothing more specific can be said without knowing what kind of piece of iron and what software is on it.