any degrading of a toy's material isn't good. TPE is actually above average according to EF's safety material guide. you can read about it in the materials safety guide or go online & research it. is it possible you stored the vibe in contact w/ some less stable material or even the same type of material?

the possibility of a toy's material degrading always exists when touching a toy with low quality material. it can even damage silicone when not storing toys safely. but even toys made of silicone are subject to degrading when in contact w/ other toys made of silicone.

after doing quite a bit of research online, I have discovered that no toy is made of 'pure silicone' despite claims made. any adult product company can make false claims & there isn't anything that prevents that from happening. to echo above recommendations, the silicone that adult toys are made of are considered the safest material.

in my reviews, I always recommend storing toys separately to prevent any damage to their material. really, prevention is the best protection for preserving toy material. although, some will melt or bleed color anyway.