Some operators say they have recently sought funding to make investments but have either not found a suitable funding source or have had their application rejected.
Mae rhai gweithredwyr yn dweud eu bod wedi ceisio cyllid yn ddiweddar i wneud buddsoddiadau ond naill ai heb ddod o hyd i ffynhonnell gyllido addas neu wedi cael eu cais wedi'i wrthod.