Android Question Debug app on device to a txt file?

Hi,

I made a app with one module and five serviçes and need to conected to a arduino to full functions... and i create a hotspot on the device so i cant use the ide to debug.
The app works very good for 2 or 3 hours but then it gets very very laggy (example: press a button and only after 30 secunds it act.....)
My idea is if is possible is to save in txt the errors or causes that provoke the lag, please any soluctions?

Thanks,

Paulo