Re: It was working but now its not..
Hi everybody. I wanted to let you know that I was having precisely the same issue.
I was able to correct the issue by re-verifying the installation of components.
The ultimate issue was the diode that is installed by the battery (D4, I believe) was installed backwards. This produced the effect of the clock working for a while, then shutting itself off. Resetting the power allowed it to turn back on - but the clock was reset.
So - if you have the same issue, check your diode by the battery backup and make sure it is installed in the correct orientation.