Update not working

i have
“Home Assistant 0.84.6 is available
You are currently running version 0.84.3”
showing on my hassio dashboard but when I click UPDATE it looks like it is going through the process but then returns to the same notification

I have noticed that if I try to install any addon this same thing happens.

Is it linked to the fact that i think I had a very brief power cut DURING my first attempt to update from 0.84.3 and maybe the update was interupted?

Any help will be very gratefully recieved.

Any errors in the log?

Yes i get this

Unknown data: b’asai\x00\x00\x00\x08\xae@\xf3*2\\x02\xfecann\x00\x00\x00\x1b’

Ive just tried it again and now I get

There are no new issues

But it still does not work

just got this message
2018-12-26 15:20:29 ERROR (MainThread) [homeassistant.components.updater] Got unexpected response: None

SORTED - thanks