I'd like to preface this by asking, please let's not start a "this would be easy to fix" route

but I present for information's sake something I've noticed.
As has been noted the issue happens at variants of :x5 minutes, there's something in the netlog called GPSS that happens around these times. GPSS seems to basically be a way of queuing transactions to happen at regular intervals, though how it's used in Elite we obviously don't know.
I looked in my Netlog from last night and it was littered with references to it, after the initial run on loading in, they are all at a minute ending in 5. One query for it alone contained a repeated part (probably the actual transaction part?) 106 times.
I did some further digging through old netlogs, found some comparable ones and searched the whole document for GPSS
July last year (pre PP2.0) in a 1 hour 20 minute session there were 26 hits for GPSS
November 2nd (post PP2.0) in a 1 hour 30 minute session there were 345 hits for GPSS
Yesterday (post Colonisation) in a 1 hour session there were 1,664 hits for GPSS
So while doing a similar thing (a few runs of a Buckyball race) since pre Power Play 2.0 there are now 64 times the amount of these transfers being made. And as Colonisation and PP2.0 grow, so will these numbers.
edit
Pre PP2.0 the transaction was only made on log in.