The biggest problem that keeps cropping up in user reviews is the unreliability of the autofill feature. Proton Pass often fails to recognize login fields correctly, fills in fields incorrectly, or logs out unexpectedly. Proton needs to make significant improvements in this area. Competitors such as 1Password and Dashlane have developed significantly more sophisticated systems that can easily handle complex forms, multi-step login processes, and unconventional websites. Proton Pass should use machine learning to learn from failed autofill attempts and continuously improve its recognition rate. A fallback mechanism that automatically tries alternative filling methods when problems arise, rather than simply failing, would be particularly important.