That sounds exactly like what happened to me two summers ago. I kept patching small sunken areas near the garage, thinking it was just regular wear. But eventually, water started pooling every time it rained — that’s when I knew it wasn’t just surface-level. When I reached out to a company I found through https://oakshs.ca/interlock-repair/, they explained that the issue was with the base layer shifting, not the pavers themselves. They re-leveled the foundation and fixed the drainage, and it’s been solid ever since. I’d say if you notice recurring dips, loose edges, or weeds growing fast between joints, it’s time to bring in pros. DIY patches work short-term, but if the base isn’t fixed, you’ll just keep chasing the same problem.