NOx sensor fault code

My 2019 2.0 diesel Karoq has the engine warning light on, and my diagnostic app reports U029E, which is "lost communications with NOx sensor B".

I guess this will either be a failure in the sensor module or a cable / connector fault.  Is there any common / typical cause behind this fault code, e.g. the sensors are known to fail easily, or the connectors are susceptible to water damage?  Also, if I ignore it fir a while will anything actually be affected?