Massive downstream drop 25th September

[#1]

Did anyone's downstream speed drop on the 25th September around 8pm? My connection went from:
72.37 at 2am - Yesterday
72.13 at 6pm - Yesterday
68.70 at 8pm - Yesterday
39.02 at 10pm - Today
Went back up to 72.37 at 2am today.

[#2]

Hi CrystalJayme,
Tests aren't showing any obvious causes for that. Do let us know if it becomes a problem again for you.

[#3]

Thanks Adam but I've just checked my account speed test and its gone from current line speed 77.2mbps from the 2/8/15 to 63.8mbps today my connection which I'm monitoring from the whitebox is showing much lower speeds usually its 72mbps is this congestion?

[#4]

Why has my speed gone from a great
72mbps 26th sept at 8am normal speed
              TO
61mbps 26th sept at 2pm and has not changed back to the normal 72mbps? that's an 11mbps drop