Try the following:
1. Re scan the digital stations on your television.
2. Check that the antenna cable is still connected from the wall socket to your television.
3. Check that your outdoor antenna is still on the roof and not damaged.
4. Try using an indoor antenna booster.
5. Consult an Antenna technician in your local area.
6. Speak to your neighbour and find out if they have been having TV reception issues as well.