It's again my cursed Surface Pro 7.
Just a few minutes ago it experienced some backlight flashing, then half of its backlight LEDs stopped working.

After a quick backup and a reboot it was temporarily fixed, but why is that happening? Is MSFT using software controlled two sets of BL PWM, or is it just one LED boost converter glitching out?
The real question for computer repairing gurus is, how long can I expect the tablet to last?
I'm asking because this is the last computer I have as my X1 Extreme is on its way to Lenovo service, so if this one dies, I will be out of computers.
If I have a good confidence that it will die soon, I'd better order a new one today to not to interrupt my workflow. But if it doesn't die, I just wasted $2000 for a third computer that I have no use of.
Any expert recommendations?