How is receptor production (recycling) regulated?
So, what is causing the higher degradation than usual? Is it the lack of the materials required to produce the receptor?


Lack of materials is almost never the reason. Receptor turnover is actively controlled by different mechanisms. Ubiquitylation is one of the common mechanisms. Ubiquitylated receptors are internalized; these internalized receptors can later on be sent back to the membrane (recycled) or be degraded depending on the conditions. 

Receptor downregulation can also happen by stopping their production either at the level of transcription or translation (For an example see this).