I have custom PCB with nRF52832 MCU and two I2C devices sharing same bus, IAM20380 on 0x68 and IAM20381 on 0x69.
All works fine, but after a few hours of testing I2C interface freezes when I2C command RX or TX is requested. This strange behavior lasts event after power-cycling and MCU reset. I have also tried discharge potential parasitic capacitance with connecting SDA and SCL to GND.
This behavior can be repaired by reheating the PCB again even with temperature which is lower than melt-point of used solder-paste. After reheat all works fine. I2C interface is running on 400kHz and SDA and SCL lines have about 1.5cm in length and both lines have 10kΩ internal pull-ups. PCB is running on approximately 3V.