Prints not sticking to the plate

I was hoping you could share some advice with me. I have reciently started to 3D print. My prints were going really well for the first week or so, but then after that I was struggling with the prints not staying stuck on the tray. I did a bit of research and talked to the manufacturer and it seemed like I had a bad printer. That printer was a Bambu Lab A1.

I took it back and upgraded to a Bambu Lab H2S. Brought it home and same exact thing. I went about a week with everything going really well and now I cant get the prints to stick to my plate.

I have looked into everything I could and have tried the following: I calibrate between prints, wash the plate between prints with a dedicated sponge and ensure they are dry, I then wipe the plate with alcohol, I turn the plate temperature up to 60 or 65 Celsius and print them on normal or silent. And my success rate is about 30-50%. 

Settings are 220 for nozzle, standard speed, 65 for heatbed, 35 for chamber.

Any advice would be very helpful