if you are i2c with your lcd you can't use analog pins of your arduino i had the same problem my screen started printing garbage and freezes and when i removed the i2c it worked fine ...all the analog pins returned to it's normal job
if you are i2c with your lcd you can't use analog pins of your arduino i had the same problem my screen started printing garbage and freezes and when i removed the i2c it worked fine ...all the analog pins returned to it's normal job