Ender 3 - Tiny strings in print
What you're seeing does not look like stringing, which I would characterize as material that exited the nozzle after extrusion was supposed to have stopped, usually due to missing or insufficient retraction, but like the extrusions along the concave contours failed to bond to the previous layer and got drawn across to a point on the other side of the contour where some degree of adhesion resumed. This happens when the lateral acceleration force of going around the curve overcomes the bonding of the new material to the existing material it's being laid down against, and in my experience it's always the result of moisture-contaminated filament. This matches your description of the problem has something that &quot;suddenly&quot; started happening.
To fix it, dry your filament. If your bed is big enough, the easiest way to do this is to lay the whole spool on the heated bed covered by a cardboard filament box with one side cut out to make a heat chamber, and running the bed heater at around 60-70°C (for PLA) for several hours, flipping the spool a few times during it. You can also use an oven but I would not trust the temperature control not to shoot up high enough to ruin the filament. If you want a less hackish solution, all sorts of specialized filament drying systems are available but I don't have experience with any to recommend. I just use my bed for PLA and oven for materials that can withstand higher temperatures.