Signal quality dropping in the evening

[Adj1]

I have been checking this problem over the past week and the symptoms and results have been consistent.

During the day from early morning through the afternoon my Sky signal strength is a steady 70 and the signal quality is a steady 90 with a good picture on all channels, however, after 5.30 - 6pm the signal quality fluctuates between  0  and 90 and the picture on the TV is unwatchable.

Has anyone come across this before?

I have tried rebooting and checking connections at the box

I was wondering if it may be a LNB  or dish alignment issue but would that not give poor quality signal permanently?

[mjstokes85]

Getting EXACTLY the same issue this past week. BBC 1 and BBC 4 won't work in the evening at all, they're a bit dodgy in the morning and then fine in the day, then as soon as the sun sets they won't work. Never had any issues until this week. Tempted to buy an LMB from screwfix and swap it this weekend, I've tested the cables, swapped them over and they're both fine. Just for info I'm not on Sky Q just on Sky HD.