ADS1299 with Teensy 4.1, DRDY stops flagging after some time

[NeuroEng]

I am using the Teensy 4.1 Dev board, with an ADS1299 on a custom PCB.

I am using this library: https://github.com/ferdinandkeil/ADS129X
and am uploading this script onto the teensy with an arduino IDE: https://github.com/ferdinandkeil/ADS...erial_OBCI.ino

The only difference I made is connecting the RESET pin to DVDD via a resistor.

The problem is, that after some time, the DRDY pin stops going low (flagging there is data ready to be collected). I can't understand why this is.

Specially, since I used an arduino uno with this example: https://github.com/conorrussomanno/A...9_example1.ino
and it works perfectly! So it can't be from the circuit/PCB.

I can't understand what the source of this issue might be :)

EDIT1: I checked the DRDY pin without running any SPI and it works fine!