A friend of mine just purchased samsung galaxy s21.
He said that as soon its temperature reaches 40 degree celsius (due to downloads) 5G is interrupted and phone goes back to 4G only.
Also battery drains fast.
He said is dissapointed by Samsung.
Does anyone here has same issue?
Is this very frequent?
One Plus is best phone, no such issues observed. 
First time I heard the fallback to legacy network due to overheat.
Yes.
It is reducing UE capabilities and DCNR when overheated.
This is the result of test of Samsung S21 that started at 25 degrees:
Few simple speedtestnet overheated the phone.
Did you try 5G on OP?
This is quite expected and you may find similar results with other chipsets as well.
But this should not happen very often.
Unless you are in colder regions, then this is a bit too fast to heat.
I find it a serious issue to disable 5G capabilities after 40 degrees.
This is not what a premium brand should do.
But then it would be re enabled when temperature is below certain threshold, right?
Yes, but it takes time to cool down.
This is typical for exynos chipsets.
Qualcomm chipsets don’t have this problem.
Hi @RFSpecialist, it is a know issue.
Samsung has released a patch to fix battery draining problems that have affected some Samsung Galaxy S21 handsets with the Exynos 2100 chip. Seemingly introduced in a recent security update, some Galaxy S21 users reported that the batteries in their phones were draining abnormally fast:
As 3GPP 38.331, The UE shall set the contents of the UEAssistanceInformation message for overheating assistance indication:
- UE may prefers to temporarily reduce the number of maximum secondary component carriers
- UE may prefers to temporarily reduce maximum aggregated bandwidth of FR1
- UE may prefers to temporarily reduce maximum aggregated bandwidth of FR2
- UE may prefers to temporarily reduce the number of maximum MIMO layers of each serving cell operating on FR1
- UE may prefers to temporarily reduce the number of maximum MIMO layers of each serving cell operating on FR2:
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Guys, anyone suggest any workaround/solution?
While doing DL UDP in NSA mode Samsung phone (Qualcomm chipset) get heat quickly and further observed SCG Failure.
Conclusion: Though many people argue that Qualcomm processor is better optimized for the US (and other countries) market and that’s why Samsung uses this processor in its US phone, but you can see that that’s not entirely true. In short, First, it’s because Qualcomm blocked Samsung to sell the Exynos processor phone in the US through their patent agreement deal. Second, it’s because the Exynos processor allows Samsung to reduce the phone production cost and diversify its processor supply chain.
Qualcomm and Samsung Extend their Licensing Agreement for 3G/4G/5G/6G Technologies
