What just happened???

[#1]

On Broadband Pro - my speeds have been superb for the last couple of weeks no slowdown whatsoever - then at around 9pm tonight my router rebooted and since then they have been shocking - take a look:
Today 21:23            787 kbps (98.4kB/s)  294 kbps (36.8kB/s)  Share
Today 21:22                 1929 kbps (241kB/s) 314 kbps (39.3kB/s) Share
Today 18:43          4134 kbps (517kB/s) 308 kbps (38.5kB/s) Share
Friday 16:30                 4118 kbps (515kB/s) 342 kbps (42.8kB/s) Share
Friday 10:45                 4108 kbps (514kB/s) 329 kbps (41.1kB/s) Share
Friday 00:18                 4112 kbps (514kB/s) 320 kbps (40kB/s) Share
Thursday 23:55         4117 kbps (515kB/s) 362 kbps (45.3kB/s) Share
Thursday 18:04         4114 kbps (514kB/s) 298 kbps (37.3kB/s) Share
Thursday 14:26         4118 kbps (515kB/s) 339 kbps (42.4kB/s) Share
Thursday 13:40         3225 kbps (403kB/s) 311 kbps (38.9kB/s) Share
Thursday 10:13         3221 kbps (403kB/s) 327 kbps (40.9kB/s) Share
Wednesday 20:56 3171 kbps (396kB/s) 292 kbps (36.5kB/s) Share
Wednesday 19:47 3066 kbps (383kB/s) 344 kbps (43kB/s) Share
Wednesday 19:47 2372 kbps (297kB/s) 336 kbps (42kB/s) Share
Feb 2,    09:42         3218 kbps (402kB/s) 336 kbps (42kB/s) Share
Feb 1, 19:14                 3216 kbps (402kB/s) 336 kbps (42kB/s) Share
Feb 1, 14:13            3228 kbps (404kB/s) 280 kbps (35kB/s) Share
Jan 30, 13:37         3230 kbps (404kB/s) 324 kbps (40.5kB/s) Share
Jan 27, 21:35         3113 kbps (389kB/s) 305 kbps (38.1kB/s) Share
Jan 27, 18:44         3229 kbps (404kB/s) 309 kbps (38.6kB/s) Share
Jan 26, 23:01         3196 kbps (400kB/s) 234 kbps (29.3kB/s) Share
Jan 25, 19:38         2714 kbps (339kB/s) 297 kbps (37.1kB/s) Share
Jan 25, 00:41         3204 kbps (401kB/s)
Any idea what might have caused this?

[#2]

Ok I just disconnected and reconnected and speeds are back up to line speed.  I was getting awful speeds when on centrall3.pcl-ag04  - now it says i`m on central l2.pcl-ag02 and things are fine again.