Hi, if you lost your QID do the following to get the new card.
1. Go to Al Gharafa immigration office, entrance 2 (Residence section)
2. At reception get the token for lost ID category
3. Go to the counter, show your passport, RP copy (if you have) and one passport size photo 
4. You have to pay QAR 200 (card payment only)
5. In 2 minutes you will get your QID card reissued. 
I was misguided by reading few old posts so I want to share my experience that I had during January 2019. 
Alternatively you can register in lost/damaged card option in Metrash2 app and follow the instructions.