Hi @Agency28877967fe2f,
That does sound inconvenient. If you have already enabled Scale Strokes & Effects in Preferences but find that it gets unchecked unexpectedly, this could be due to:
1. Sometimes, Illustrator preferences get corrupted. Try resetting your Illustrator preferences (https://adobe.ly/4i7uEmD) and enabling the Scale Strokes & Effects again.
2. Check if this happens in all new documents or just specific ones.
Let us know if the issue persists after resetting preferences!
Best,
Anshul