Last post you wrote by disconnecting one Lnb cable rebooting stop.
Rebooting is back may be same cable still connected.
Disconnect faulty cable and try to push very hard your hdmi cable .
Tm-2t do not have any history of re booting unless external short/Had disk/Lnb cabel/USB/faulty hdmi cabel/faulty scart cabel/any external connection can create re booting otherwise it will damage the box.
Finally ring tm or send an email to
info@technomate.com they might have solution or replacement if this box is faulty.