Bosch SGS46E22GB/90 dishwasher

Hi,
I am having some problems with the above. I normally set the timer and run the machine overnight, but last week I came down in the morning and noticed that all of the lights were off, indicating that it had popped the fuse. I have a fuse above the work top and the plug is below the worktop, so I changed the fuse above the worktop. The machine sprang into life again – it had gone off with about 28 mins left on the cycle. It finished the wash. I had one wash with no problems, then the second one did it again. Again I changed the fuse, it had 128 mins left on the program. It popped again and has once more since. All at different times in the cycle. When I exchanged the fuses with the washine machine to check if they had blown – they had not – only the dishwasher goes off. The fuse box is ok too. I didn’t pay a huge amount for the machine and I would rather repair it – but not if it will be unreliable and I end up replacing it in 3 months anyway.. The machine is about 18months – 2 years old. Can anyone give me any advice on this?

Many thanks.