@TKZee
Hi, welcome to the community.
May I know how many times you have noticed Deco X60 lost its configuration?
Would all three Deco X60 start flashing blue after the power failure?
I could only think of two causes for this issue:
1. You might accidentally press the reset pinhole after the power outage.
2. The network was accidentally deleted on the Deco APP after the power failure.
Since the reset pinhole is quite concealed, I tend to think it might be the second one.
If neither of them has been done, could you please refer to this link and help me submit the APP log:
How to submit Deco APP log
By the way, I see you had the Deco for a while. Did this issue just start recently?
Wait for your reply.
Best regards.