Unexpected packet loss on idle ADSL

[#1]

Any suggestions as to the possible cause of packet loss peaking just before 8pm on this connection?

[#2]

I've just had a look and can't see anything obvious that'd cause it. There were no spikes of usage on your account. Can you let us know if it happens again?

[#3]

Seems to be ok since, I'll keep an eye on it.

[#4]

Another bout of unexpected packet loss, about the same time as last night, could this be a congested exchange (Aberystwyth)?
Don't worry about the block of packet loss about 10am, we had a power cut this morning.