Suggested fix (unconfirmed): Wait for one minute when the unstable connection message appears, then press the X to close the dialog. Alternatively, click confirm instead of reconnect if you see a poor connection message.
Suggested fix (unconfirmed): Verify the integrity of your game files through the Steam library properties. Alternatively, use Cloudflare WARP to bypass the connection issue.
Suggested fix (unconfirmed): Use special characters or Cyrillic lookalikes to replace the filtered letters in your name. Test different variations until the game accepts it.
Suggested fix (from YouTube, unconfirmed): Prioritize story progression and missions to unlock locked features and earn Pyroxines. Match your team to enemy weaknesses using the enemy info menu or auto-assignment, and complete active guide tasks to learn game mechanics while earning rewards.
Suggested fix (unconfirmed): Attempt each difficulty at least once, even by forfeiting with a weak student, to unlock the achievement and pyroxene rewards for that tier.
No confirmed fix yet. Players suggest: nvm i know how to fix it now :) Sorry to be annoying about this as I literally don't need this advice personally, but I've encountered a lot of forum posts in the past that ended/got locked with a "nvm i fixed it" that…