Your signal is weak because either:
1) there is an obstruction (like a tree) in the line between the satellite and your dish
2) the dish is not aligned correctly
What kind of signal strength do you get? With my system, Humax FoxSat HDR, on a channel you can receive press the 'I' (info) button on the remote to get the channel info bar across the bottom of the screen. On the right side there are two horizontal bars showing signal strength and quality. These are both on 90% to 100% with mine...
Thanks for the help
From Davos, Astra 28.2 is at 155° azimuth and 33° elevation
Go stand at your satellite dish.
Face 155° (use a compass)
Look up 33 degrees.
That is where the signal comes from
At only 33 degrees elevation, you may have a mountain blocking some or part of the signal.
If the signal is being blocked by the mountain you have 3 choices:
1. Move the mountain
2. Move the house
3. Get a bigger dish & better LNB