Hello Oxa and mcbee,
I did not abuse any rules, I believe. My real bets are over the minimum of 2€ and about the monitored markets without making a bet, only football in test mode... 6 games yesterday and 4 games the day before.
Also, the last email I received from betfair was 29 August with a 25% refund in horse races.
Anyway, this seems to be a bug.It happened when I tryed to see the P/L, then some hours later I logged in again and tryed to do the same and did not see any suspension warning. Weird.