select distinct qa.id,qa.question,qa.answer,qa.video from qa left join products_groups pg on qa.gid=pg.id left join qa_products qap on qa.id=qap.qid
where (qa.pid=15509 or ( qa.gid>0 and (pg.products like 'PS14-5900-45-GRY,%' or pg.products like '%,PS14-5900-45-GRY' or pg.products like '%,PS14-5900-45-GRY,%') ) or qap.pid=15509) and qa.status=1 order by qa.ts desc - MySQL server has gone away 
