Samsung

1

Turn off automatic optimizations

Open: Settings → Battery and device care → Battery → three dots (top right) → Automation → turn off "Auto-optimize daily" and "Adaptive power saving"
Samsung runs a daily optimization that can freeze VPN even after you whitelist it.

2

Turn off adaptive battery and app sleeping

Open: Settings → Battery and device care → Battery → More battery settings → turn off "Adaptive battery" and "Put unused apps to sleep"
These two toggles control Samsung's aggressive auto-sleep — the main reason VPN drops.

3

Remove VPN from sleeping lists

Open: Settings → Battery and device care → Battery → Background usage limits → open "Sleeping apps" and "Deep sleeping apps" → remove Tuman VPN from both lists
Samsung re-adds unused apps to these lists every few days.

4

Add VPN to never sleeping apps

Open: Settings → Battery and device care → Battery → Background usage limits → Never sleeping apps → add Tuman VPN
Apps on this list are permanently exempt from background limits.

5

Allow unrestricted battery use

Open: Settings → Apps → Tuman VPN → Battery → Unrestricted
This removes the per-app power limit.

6

Lock in recent apps

Go to: Recent apps → long-press the Tuman VPN icon at the top of its card → tap "Lock this app" (or "Keep open" on older phones)
Locked apps stay in memory and keep running.

VPN keeps turning off?

What's happening

What to do

Steps