Yes that was the norm back in the 3G only days. But as you can see, the 3G radios are working better for you, so they definitely have an LTE signal issue (but if you have other phones and are better on LTE then it's not that) or their firmware screwed the LTE radios.
Do you have other LTE only features like VoLTE or enhanced services?
Considering I have no idea what VOLTE is I highly doubt it lol