Haddock

I'm having intermittent problems unlocking Enpass. Sometimes it won't recognize the password. When this happens on my (Linux) desktop, it also happens on my Android phone. If I try again after about 30-40 minutes, it works fine. I'm using 5.3.0 on Linux Mint 18 KDE with Dropbox. I'm concerned that it may lock me out completely. Any idea what might be happening?