The service faced difficulties in reporting due to staff shortages, and it heavily reduced the provision of online services after restrictions eased in September 2021.
Ers hynny, bu tuedd tuag i lawr yn gyffredinol, ac ym mis Hydref 2021 roedd y perfformiad misol ar ei lefel isaf ers i ddata cymaradwy ddechrau cael eu cofnodi ym mis Ebrill 2012.