If it's just the sockets that trip then the machine is taking too much current - if you lose sockets AND lights there's a short to earth - the breaker trips as a safety measure to protect you from electrocution...
Either way you will probably do best to call in an appliance engineer however... this 2 years you mention? If it's one year 11 months you may be able to have it fixed as a warranty job - European standard warranty is now 2 years from delivery. You will need proof of purchase.
Good luck...
Peccavi
October 2009