Problems in Tiger T8 High Class HD & Tiger T800 Plus HD

[tiger]

1) Tiger T8 High Class HD
TV start changing display every few seconds, 1980x1080 to 1980x540, 1980x2, 1980x1 and etc

Some time, tv asks to change settings of pc,or it asks tv does not support signal,

different colors bars start appearing on tv screen

it even restart after 1 or 2 minutes

i changed hdmi cable, only 1 cable work but these issues, other 3 hdmi cables doesnot even show tiger log, only black screen as none of device seems detecting. i was even able to reset the software, but same problem.

2) Tiger T800 Plus HD

few days ago, it was stuck at "booting", it was showing in lcd of reciever.
now, only green light of tiger showing, (not in lcd of receiver, only tiger name in receiver which is in t800+ hd, above on lcd of receiver)