[Layer shift in prints on Ultimaker 2 +]

Hello All,

I have been using my Ultimaker 2+ for 10 months now.

No problem. Excellent prints.

But in last two days I am getting an issue of Layer shift.

I am sharing some images with you all to help me our with the problem.

I have tightened all the pulleys . Even the small ones.

I really need help because it was working absolutely fine until yesterday

.