Wrong data in running

Since yesterday, when running my watch is useless. 

My pace goes to 30s per km (multiple WR incoming?). When I change to bike, it seems alright. I did no change. 

Today, I tried to walk 20s and watch recorded 300m with 344m total ascent. Not sure if reset the watch will work. I turned off multiple times.

This started to happen after the watch battery died during a run. Not sure if it correlated but I have a watch that is useless currently