Troubleshooting Long ChatGPT thread starts forgetting earlier turns. Usually the model's context window filled up, attachments are eating tokens, or you got routed to a smaller-window tier. Diagnose and fix, with exact June 2026 token limits.
Troubleshooting Custom Instructions are saved but ChatGPT ignores them mid-chat. Usually a Project override, a Memory conflict, context overflow, or a silent model switch. Make them stick.
Troubleshooting Resume a Claude Code session and it acts like a fresh start — forgetting the plan, the decisions, the half-finished refactor. Diagnose compaction, broken transcript chains, and ephemeral tool results, then fix it.
Troubleshooting Memory is enabled but Settings shows 'No memories yet' and Claude never references past chats. The usual cause: only 'Search and reference chats' is on, not 'Generate memory from chat history'. Here is the fix.