Hi @limandri - welcome!
In addition to the great advice that Kent has provided above, I would add a couple of things:
First, if you are seeing intermittent issues logging in, then you are most certainly doing something inconsistently. It is not Bitwarden behaving inconsistently. Here are some of the things that often cause a password to fail, even if are “certain” you are typing it correctly:
- missing a capital letter
- mistyping a punctuation character (e.g., ’ instead of `)
- mistyping a character (e.g., 0 instead of O)
- using international characters and/or an international keyboard
- using the correct password but mistyping your email address at login
Second, the only way to confirm that Bitwarden is behaving inconsistently is to type out your password in a text editor (no need to save it), and copy and paste it into your login, perhaps modifying it slightly each time until it works. Once you have it working, keep pasting it in over and over at each login, and you will see that it always behaves the same way (unless you change keyboard layouts, change machines, etc.).
I suggest that on your next successful login, change your master password to something that will be easy to enter, has no international characters, but will still be secure (i.e., un-guessable and at least 14 characters), as well as backing up your Bitwarden vault, as Kent mentioned above. I hope you figure out your issue.