Hi guys. I recently moved to a new apartment. They have a stand up shower with a plastic shower pan in one of the bathrooms. When standing/walking in the shower it flexes and makes very loud creaking/cracking noises (I only weigh about 140 pounds). The closer you stand to the drain, the more obvious the flexing and noise is. Sounds/feels like the plastic has gaps under it or something. More frustrating than that, after taking a shower, the pan makes very loud popping/cracking noises for about an hour (every minute or two) Maintenance basically said they won't do anything and that it is just how these plastic showers are. Is there anything I can do on my own (that's not super intrusive) other than just deal with it? Thanks so much!