App crashed

Go to Youtube app setting ,
Clear cache
Reset the app
If the problem still persists reinstall it

Well i know about clearing cache but they need to fix the cleaning thing like you literally have to clean cache every time to watch youtube

Try to optimize by galaxy app booster...go to crome and download then optimize now

Dear Samsung member,

Greetings from Samsung customer support.

Thank you for sharing your concern. We acknowledge your query and apologize for the same.To resolve this issue kindly follow the given below steps:

Clearing the app cache is kind of like a cleanse for your apps. It will get rid of residual files that could be slowing down the app.
Open Settings, and then swipe to and tap Apps. Select or search for the app you want to clear. Tap Storage, and then tap Clear cache.

Step 1. Go to Settings > Apps.
Step 2. Tap on More options (three vertical dots) on upper-right corner > Sort by > Size.
To delete:
Step 1. Go to Settings > Apps.
Step 2. Select an issued app.
Step 3. Tap Uninstall to free up storage space.

Improper App installation may also cause Android Apps crashing problem. You must download the App from the Google Play Store/ Galaxy store and use it only after it is successfully and completely installed on your device. In case your Apps stop abruptly, delete or uninstall the App from your device and install it back carefully after a few minutes.

Step 1. To uninstall apps on an Android device, go to Settings > Apps.
Step 2. Select an issued app > tap on Uninstall.
Step 3. Go to Google Play Store and reinstall the App again.

If your issue will be not resolved, Please follow this path to register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report).
Note. please attach the error log file within 15 minutes of the error occurring.

Thank you for writing to Samsung.
Warm regard,
Samsung customer support