Long shot, but if you suspect it's lack of processing power it's easy to try a 3.3V 16MHz Pro Mini.
M
MaAh
@MaAh
Posts
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[SOLVED] 3.3V 8MHz pro mini as GW, should it work? -
Running a 5v Arduino at 3.3v on battery@thecricketer some ideas here https://www.youtube.com/watch?v=FqtNsIKpZAw
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5v vs. 3.3v Pro Mini battery powered nodesA video here https://www.youtube.com/watch?v=kEkD4SLMX8Y on some different ways to power the Pro Mini