Exact menu names vary with the phone and its software version, but these are the settings to look for.
Samsung
Settings, Apps, Fuzz, Battery: choose Unrestricted. Also check Fuzz is not in "Sleeping apps" or "Deep sleeping apps" under Battery, Background usage limits.
Xiaomi, Redmi and POCO
Settings, Apps, Manage apps, Fuzz: switch on Autostart, and set Battery saver to No restrictions.
Vivo and iQOO
Settings, Battery, Background power consumption management: allow Fuzz to run in the background. Also allow Auto-start for Fuzz.
Oppo, Realme and OnePlus
Settings, Apps, Fuzz, Battery usage: allow background activity and auto launch. Set battery optimisation to Don't optimise.
iPhone
Settings, Fuzz: set Location to Always with Precise Location on, and switch on Background App Refresh. Low Power Mode can delay updates.
