Unreliability emerged as a significant concern, with frequent mentions of services being full, late, out of service, or cancelled without sufficient notice.
Daeth annibynadwyedd i'r amlwg fel pryder sylweddol, gyda chyfeiriadau mynych at wasanaethau llawn, hwyr, wedi'u canslo heb ddigon o rybudd, neu ddiffyg gwasanaeth o gwbl.