I can only type a short phrase or a few characters into the YouTube app search box.
NOTE: Not all Sony® products have Internet capability or offer the YouTube feature. To see if your unit has these capabilities, check the specifications or supplied operations guide. Manuals are posted on your model support page.
Only up to 19 letters or numbers (including spaces) can be entered into the search box of the YouTube® app installed on this product. Anything more than 19 characters is not supported. This is normal operation.