Random period after 4 years on Kyleena

I’ve had the kyleena iud for 4 years with no issues, my period basically stopped and I’d maybe have extremely light bleeding every 4 months if even that. I had brown spotting the last week and it’s now turned into full blown period that’s bright red and a lot heavier than normal. I’m having mild cramps but nothing agonizing. Is this normal? Has anyone else had a similar experience as it’s kinda freaking me out.