Wifi Problems

[AutumnBlue]

Whenever I connect my phone to WiFi after getting home, a few hours later it disconnects and goes onto mobile data, which I have barely got any and i have incurred a £2 charge for it. Can somebody help me with it? (I'm using the Galaxy A13 SM-A137F)

[-Robot-]

Is that option to switch to mobile data if WiFi signal is weak turned on? I can't remember on the top of my head where it is but should be under connections

[AndrewL]

@AutumnBlue: Further to the above, please try heading to Settings > Connections > Wi-Fi > Tap the 3 dots in the top right > Intelligent Wi-Fi > Switch to mobile data, and toggle this option off if it is active. 

[GoanGeek]

Try resetting your network settings under reset