Data connection comes and goes

[bolddoodieS9]

Three days ago I activated my data (android phone). All went all. Connection made. After 30 minutes it disappeared. Reactivated it. Nothing. Rebooted the phone. Nothing. Did all as recommended by the community. Nothing. This morning, after charging the phone, data connection (4G) reappeared -- and worked fine. To test it, I rebooted the phone. Data connection disappeared. Very fickle apparently. Phone is Samsung Galaxy J3V. Anyone have a clue?

[NDesai]

@bolddoodieS9 Try forcing it to connect to 3G/HSPA network from settings and see if that changes anything. Double check your APN settings and make sure it matches with the one found here: Public Mobile APN Settings - APN Settings Canada (gishan.net)
You can try the sim in another phone to see if it could be an issue with your phone or sim.