@nina san miguel As you appear to be on the latest firmware (04.26.10) already, it is NOT worth trying to install the same level again.
Your issue might be something called DNS (it is how the browsers and any internet connection get from your device, to a known site, e.g. Microsoft.com to the actual computer server IP address closest to your area). Sometimes the "default" settings do not work very well, as it may rely on your ISP or router.
So, if you go to your NETWORK settings in your TV, in the DNS part, try putting in 8.8.8.8 (that is the public Google DNS service IP address), and some TV users find this fixes some odd intermittent APP failings, where some work OK, and others have odd issues. Don't forget to select the "save" for the new setting, as some UI (User Interface) windows need this (depends on the TV model), sometimes it is near the bottom, so easy to miss, before you come out of the settings UI/APP.