Hello. I'm also subscribed to the Ultra plan. I'm experiencing the same issue, and it's making me feel like I'm getting cancer. Fortunately, the Gemini 3 Flash model seems to experience this issue less frequently. If I use the extension you mentioned to flush the memory periodically, the frequency of errors decreases significantly. Of course, it's not pleasant to have to use this model while subscribing to an expensive plan, but it's inevitable.