Unable to Browse from 11pm

A few ideas ..

1.  Tell the hub and discuss. There could be many reasons.

2.  Loss of satellite link - one way or the other.  This could be due to serious dish mispointing, either your dish or the hub dish.  Don't touch anything at your dish for the moment.  Observe only.  Measure the bit error rate every hour or so over the whole day.  How does it change ?.  Plot a graph over time.  Does it gradually get  worse during the evening and improve gradually in the early morning?  Is it really bad between 11pm and 8am?.  If so, then the satellite may be on the side of the main beam and its small diurnal movement can increase and decrease its level by several dB.  Remember the transmit beam is narrower than the receive beam.  When pointing you must adjust to the exact centre - adjusting for a just good enough receive signal is quite inadequate.  
 
3.  If the bit error rate increases suddenly or the service fails suddenly consider loose F cable connection (fails at low temperature).   It is also possible to have LNB or BUC faults that come and go with temperature changes.

4.  Interference is a possibility but this needs someone with spectrum analyser to detect.  Maybe someone puts up a carrier each night between 11pm and 8am.  Is your polarisation well adjusted?.

5. Traffic.   During the period when browsing is a problem try to work out if any traffic is getting through.  Is some application on the cafe LAN overloading the satellite link?.  Does some automated backup software activate itself and try to upload many Gbytes of files to some backup centre somewhere?.  Is someone running an automated downloader and receiving excessive data ?  Maybe some other site on the same network has such a problem and is blocking everyone - ask the hub to check traffic to/from each site.

Best regards, Eric.