For security, IAT Search uses a few session rules:

• Automatic sign-out after inactivity. If you are inactive for a period, your session expires and you will be asked to sign in again. Activity keeps the session alive.
• One active session at a time. Signing in on a new device or browser signs you out of the previous one. If you are unexpectedly signed out, it usually means your account was used to sign in elsewhere.
• Password reset. Use Forgot password on the sign-in screen (email-and-password accounts only).