Battery drain / weird issues

I'm experiencing some strange issues with my device, including more battery drain than usual.

Software version 19.18

Battery

Previously battery would last for 1 to 2 weeks, but now I have to charge every 2 days. Is there a way to enable logs, or another method to determine what is causing the drain? I have done a complete reset and that did not resolve the issue.

GPS sync

It seems to take longer to to sync with the satellites. I have it set to All + Multi-Band and would have thought that this mode would easily get a lock fairly quickly. Sometimes I have to wait 30 seconds or more to sync.

Run map

I went for a run today and on the map it showed I stopped 4km before I actually stopped. However, the splits and all other stats continued on correctly for the full distance. Does this mean that I lost the GPS signal?

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Any advice or tips on how to resolve these would be much appreciated. I haven't had any of these issues before the most recent software update.