How long will it take before my download speeds increase again?
Probably at least three days (if your sync was low for more than 75 minutes).
Also, is there any reason why my connection synced so low?
Probably a noise spike (maybe a boiler igniting, a plasma TV or streetlight switching on - could be anything).
Keep a close eye on your noise margin over the next few days, to see if it fluctuates (more than a few db signifies EM or RF interference is affecting your connection).
What router do you have? Maybe it's the type that can be monitored (there's a lot of monitoring software around).
Maybe carry out the checks/suggestions made
here.
Ade
Happy New Year, people!
Giving UKFSN/Entanet a try
DL Sync 4096kbps
UL Sync 448