The Galaxy A35 is a mid-range phone with an Exynos 1380 chip, and its owners describe heat in a way that points at two ordinary causes before any fault. The first is use: continuous use for thirty minutes or more, a 5G connection in a weak-signal area, a game or a long video call all warm it. The second is One UI 8.5, after which owners on Samsung's forums report heating and fast drain,
though one owner found the heat stopped after cleaning storage down to 75 percent, which fits a phone whose system struggles when nearly full. The practical order is to clear storage, install the newest patch, turn 5G to LTE where signal is poor, and remove the case. A35 owners also describe slow charging, so charging heat is a third cause: a 25 W charger takes about eighty minutes for a full charge.
Differential
Likely causes of “Samsung Galaxy A35 5G gets hot or shows a temperature warning”, and how to tell them apart
- 1
A nearly full phone
What separates it Heat and lag when storage is above about 80 percent
How to confirm Free storage down to about 75 percent; one A35 owner found the heating stopped
- 2
One UI 8.5 settling
What separates it Heat and drain began after the update
How to confirm Install the newest patch, restart and wait up to two weeks
- 3
5G in a weak-signal area
What separates it The phone is warm on trips and away from Wi-Fi
How to confirm Settings, Connections, Mobile networks: set LTE where 5G is poor
- 4
Continuous heavy use
What separates it Warm after thirty minutes of gaming or video
How to confirm Rest the phone and lower brightness and game settings
- 5
Charging while in use
What separates it Heat during a 25 W charge
How to confirm Charge idle, without a case
Before you touch a setting
Record this first — changing settings destroys the evidence
- Free storage as a percentage
- Whether the heat began after One UI 8.5
- Whether it is warm on 5G and cooler on Wi-Fi
- The case and charger
Try in this order
0 of 6 completedLook at storage first
ReversibleSettings, Battery and device care, Storage: if used space is above about 80 percent, free space down toward 75 percent by moving media to the microSD card or deleting what you do not need, as one A35 owner did when the heating stopped.
Install the newest patch and restart
ReversibleSettings, Software update, then restart; owners tie the heat to One UI 8.5, so a later patch is the first software fix.
Switch to LTE where 5G is weak
ReversibleSettings, Connections, Mobile networks, Network mode: pick LTE for a day if the phone is warm on trips or in weak coverage.
Take the case off and rest the phone
ReversibleA case traps heat from the Exynos 1380 on a long session; rest the phone in the shade for ten minutes.
Charge it idle
ReversibleUse Samsung's 25 W adapter on a hard surface without using the phone, because charging while using doubles the heat.
Test in Safe mode
ReversibleHold the power key, Power off, Safe mode: if the phone stays cool, remove recent apps one at a time.
Model-specific
What is true of this model and not of its siblings
- A quick way to see if it is storage
- Look at Settings, Battery and device care, Storage: if used space is above about 85 percent, free space first, since owners found the A35 cooled once storage fell to 75 percent.
- 5G and the Exynos 1380
- The A35's modem works harder on 5G in weak coverage, and the Exynos 1380 is a mid-range chip, so LTE in poor signal is the cheapest way to cut heat.
Stop boundary
When this stops being a self-service repair
- !If the A35 is hot at rest in Safe mode, send a Samsung Members error report and book a check
- !If a swelling back appears, stop using it
- !If heat is only during charging with the Samsung charger, ask Samsung to check the battery
Evidence ledger
Sources behind this answer
Samsung's overheating guidance.
A long thread about A35 heat and drain.
A trade-press list of A35 problems and fixes.
Battery, charging, chip, storage and microSD slot of the Galaxy A35 5G.
Exact questions
Common questions
How long can I use an A35 before it gets warm?+
Owners report warmth after thirty minutes of continuous use such as gaming or video calls; short breaks keep it comfortable.
Should I turn off 5G permanently?+
Only in weak-signal areas; in good coverage 5G is fine.