We have a new Anova Chamber Vacuum machine. It worked great for the first 8 smaller bags (6x9). When I switched to sealing meats (10x10 bag size) I noticed the first 3 did really well. Then the other 5 showed air pockets in them. I waited 30 minutes and tried to seal the last 2 and the same thing. I have tried increasing the vacuum time to 40 seconds and using a strong and normal seal time. I tried wiping down the seal around the lid and the contact rim on the base, I tried putting slight pressure on the lid when I hit the GO button.Nothing changed. Still not getting a complete seal! What could be causing this? I’ve had this a week and only used it once!