Stop streaming, turn off your WiFi, either by disconnecting your router, or turning both options off, in your VU+ menu, then check all your timer lists, or do a fresh installation, without using any backups. If the problem ceases then you know that either you've been hacked, or somebody else, near to your receiver, is accessing it.
What passwords have you changed? Your streaming device, laptop, or other, might have been hacked, so changing the password, on your VU+, might be useless, if someone has access to your laptop, and your passwords are stored, equally if they have a keylogger, or other malware, installed, that can detect all your passwords.