I bought 3 Ebay/Amazon/Alibaba 3 watt amps. Found no heat transfer grease under the board. Check yours. This would lead to early failure.
Ed
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Might be good to share which modules you’re talking about.
There are several models. They are 2-700 MHz up to 5-2000 MHz. All in the under $25 range.
Here is the model I bought.
I do recall at least 1 person burning them up in use. Checking for heat transfer grease is a good idea.
Ed