Stronglifts timer freezing on Android devices

The Stronglifts timer will freeze if you put the battery settings in restricted or optimized mode.

Here's how to fix this:

  1. On your homescreen, tap/hold on Stronglifts
  2. Select "App info"
  3. Go to "battery usage"
  4. Put this to "unrestricted"
Now log a set in Stronglifts so the timer runs. Switch apps, come back, the timer will still run. Problem solved.
If you put the battery setting of Stronglifts in restricted or optimized mode, your phone will try to save battery life by killing the timer when switching apps.

If you have a Xiaomi device see also this: