Hi,

I recently bought Sony WH-1000X M3 headphones; they're great and the noise cancelling is excellent almost all the time, except in train tunnels.

Here, the noise cancelling often cuts out (or otherwise changes) intermittently as the train goes through a tunnel.

I returned the first pair due to this, but the replacement pair exhibits exactly the same behaviour. 

I suspect this is air pressure change related.

A huge part of my usage is likely to be on trains, in particular underground trains, and they are just no good in this situation. The background rumble just switches in and out as the train travels through the tunnel.

Does anyone else have this problem, or has anyone found a solution? 

By the way, Adaptive Sound Control is definitely disabled, and I have tried multiple optimiser runs.

Thanks in advance,

Rob