They might have 'operational issues' as well.
Last year, I was listening on the KRT frequency, and here comes Egypt Air, enroute southern Africa.
They were told by KRT that due to crossing traffic, they had to descend.
They objected, and were then told that if they did not descend, Nairobi would not accept the flight at the FIR boundry.
Egypt Air did not descend, and did not reply to further KRT transmissions.
Going 'silent' is not a good modus operandi.