Town Wall Depreciation

I've checked forums, updates, etc so I'll throw this out.
I'm seeing what I have never seen before- walls depreciating (that is going purple or weaker) while still under an active Town Bell that has never been empty. Seems only under a combination of Bell and PClaim are walls immune to time. Under Bell alone- anything goes?
Is this just wall Maintenance, designed, or a bug? Stone wall was perfect for 3-4 months...and only now has started to show signed of deterioration. It was Raider wall and now it's mine- it's been mine for almost 3 months and now it's falling apart. My Brick/plank walls are showing no loss of integrity.
Just saying- maybe you all need to check the perimeter for weakness depending on what the answer is.
Thanks
I'm seeing what I have never seen before- walls depreciating (that is going purple or weaker) while still under an active Town Bell that has never been empty. Seems only under a combination of Bell and PClaim are walls immune to time. Under Bell alone- anything goes?
Is this just wall Maintenance, designed, or a bug? Stone wall was perfect for 3-4 months...and only now has started to show signed of deterioration. It was Raider wall and now it's mine- it's been mine for almost 3 months and now it's falling apart. My Brick/plank walls are showing no loss of integrity.
Just saying- maybe you all need to check the perimeter for weakness depending on what the answer is.
Thanks