all of a sudden lots of back ground noise.......nothing changes when I adjust knobs on the interface, turn off speakers etc itself but does change in pitch and crackle (i.e. when I use the computer (e.g. moving cursor, typing etc, the hiss and hum gets louder and more crackles, pops, etc). I'm using Mac Airlbook M1, running Sonoma 14.1.2. the thunderbolt cable is direct from apple in the last month. I haven't tested this with another as I don't have one to hand (or the money to spend on a new one today). Wondering if this is software related (i.e. updating to Sonoma) or a dodgy cable or something more serious/ known fault etc.