I took a few long recordings yesterday at a conference and they are no where to be found on my pocket. 
I tried resyncing and get notifications there are no other recordings I know had a few hours of recordings.
I am having the same problems. The light is on, it vibrates like it is working, but then nothing. This is very disappointing and it looks like you have not received a response, so this is a bug and no one is working on it.
Can you please email hey@heypocket.com? The team will investigate the issue and see what’s going on.