Hi Cris,
Which version version and algorithm were you using, how long was it left on and had you recorded anything to memory? How much feedback was it getting? With a lot of feedback it is normal that it gets noisy after a while.
If possible, please record a video of this happening with good clear audio and so we can see all the settings on Cosmos, and send it to Soma support at [email protected].
We also need to know the firmware version and algorithm you are using, along with your input and output chain. Thank you!
Btw, we just released a new firmware version (COSMOS_M1.41.smf) yesterday with some rare bug fixes, I recommend you download and install it from here: