Gradually losing HD channels

Been gradually losing HD channels over the last two weeks.  Started with some sports stations, now it's growing to many more. SD stations seem OK. Tried rebooting reciever, tried re-tightening connections, nothing's helped so far.

Satellite transponders (32 total at 101º)
[Most of your standard definition channels are beamed from 101ºW]
1-8 83 80 84 66 82 91 80 88
9-16 80 77 80 95 80 90 78 90
17-24 78 57 78 95 80 91 80 90
25-32 80 93 78 0 83 90 80 91
 
Satellite transponders (3 total at 110º)
[A few HD channels, also beamed from 99 & 103º]
1-8 NA NA NA NA NA NA NA 67
9-16 NA 71 NA 65 NA NA NA NA
 
Satellite transponders (11 total at 119º)
[Local SD channels for some cities, Spanish package]
17-24 NA NA NA NA NA 97 38 0
25-32 94 98 100 96 93 97 95 98
 
Satellite transponders (16 total at 99º(s)) [or 99º(b)]
[Local HD channels for some cities]
1-8 0 0 0 15 0 22 NA NA
9-16 NA NA NA NA NA NA 41 65
17-24 0 0 81 60 71 48 0 23
[Note: these can be very slow to appear]
 
Satellite transponders (14 total at 99º(c)) [or 99º(a)]
[National HD channels]
1-8 58 30 55 30 58 33 51 30
9-16 56 33 52 37 58 37 NA NA
[Note, these can be very slow to appear]
 
Satellite transponders (16 total at 103º(s)) [or 103º(a)]
[Local HD channels for some cities]
1-8 0 0 0 0 0 0  NA NA
9-16 NA NA NA NA NA NA 56 0
17-24 0 0 0 0 0 0 46 0
[Note, these can be very slow to appear]
 
Satellite transponders (16 total at 103º(ca)) ["0" until new D12 satellite live]
[National HD channels]
1-8 NA NA NA NA NA NA NA NA
9-16 0 0 0 0 0 0 0 0
17-24 0 0 0 0 0 0 0 0
 
Satellite transponders (14 total at 103º(cb)) [or 103º(b)]
[National HD channels]
1-8 0 0 17 0 20 0 20 0
9-16 22 0 22 0 20 0 NA NA
17-24 NA NA NA NA NA NA NA NA