Live stream with multiple audio channels taking half a minute to change channel

Hi, We are using a live stream with multiple audio channels and JW7 is picking them up correctly. However, when you change audio channel it takes easily half a minute to actually change. This can be really confusing as it looks like nothing's happening users tend to try a different channel, which just makes the whole thing take longer. We do not see this happening on video on demand, the channel changes immediately. Any idea what's wrong here? Chunks in the stream are set up to 4s at the moment, so it's not just waiting for the chunk to end. The stream (will be down in the next couple of days) is: http://delta-1-6app3g3w06el5.cloud.elementaltechnologies.com/out/u/aws_test2.m3u8 Thanks!