My Wi-Fi stopped working as usual

My Wi-Fi stopped working as usual. Some devices, like my computer and cell phones, couldn't connect anymore. Only the TVs were able to connect. We couldn't even see the Wi-Fi network to connect to it. I went onto WhatsApp and started chatting with the RSAweb technical department. They instructed me to reset my TP-Link Deco, but I wasn't sure how to do that. They shared pictures to guide me through the process. After waiting for a long time, I finally managed to reset my Wi-Fi link. However, my Wi-Fi was now open and didn't have a password, and it had been set up by my husband. RSAweb came to the rescue again. I'm unsure what actions they took that led to this situation, and I wish they had notified us as clients. Nonetheless, I have learned quite a lot through this issue. Thank you to Siphokazi for the help.