yeah i know mite spots are usually smaller, just throwin a bug problem out there
Also consider a fungal issue like septoria leaf spot it is an airborne fungal spread by wind and rain and the disease travels up the stem of the new plant and affects the leaves as it reaches each new branch in turn. Eventually, the disease causes the leaves of the plant to prematurely fall off.
Also, these are the signs since you said it was spreading, It starts on the bottom leaves where the fungal spores are most likely to land, It spreads upwards from the lower older leaves to the newer younger leaves so the loss of leaves is from bottom of the plant upwards. Leaves wither and die, they turn slightly yellow, then brown and then wither.
again just throwin stuff out there of things it looks like dont really have alot of info to go on but tryin to help

good luck w the grow