Did you get any late payments during this? All my student loans bounce in and out of deferment for being in school and I've never seen a drop like that, or any drop/ gain in points when they go back and forth.
Are you looking at fico scores? I don't think I noticed any changes in vantage or plus scores either when it happened but maybe they score differently.
Also, were you making full payments each month or just the amount that you thought it should be, that could make it a partial payment and could eventually hurt your scores.
Thats all I can think of but paid on time and in full student loans should not have an impact on your fico scores. The accounts are still there, they just show has having no payment due. I applied for a mortgage when I started school a couple years ago and it had no impact with my scores and actually helped my DTI because no payment was due for 2 years.
If it’s not a late payment then what I would likely think it was since there was no payment for March which means interest maturing and increasing the loan or loans balances; would be that your loan balance or balances may have exceed the 100% threshold or gotten higher than the original loan balance in short.
