Here's an old thread about the issue. Seems like it was around 2016. Looks like the cracks were at the same place as yours.
https://devialetchat.com/Thread-Cracked-...ight=Crack
https://devialetchat.com/Thread-Cracked-...ight=Crack
Living room: Sigberg Audio Manta/10D subs, MiniDSP SHD.
Den: Tannoy Precision 8 iDP/TS112 iDP sub, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage
Den: Tannoy Precision 8 iDP/TS112 iDP sub, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage