I've never seen Lantana die back like that. Here it grows year round, though some seasons it flowers for months at a time then for a bit will be just greenery. They advise to keep it pruned to have bushy plants but I haven't figured that out when to do that because it seems always to be blooming and it hurts my heart to cut off all that color. So mine tends to be very viney and I think DH sort of piles it back up on top of itself.
In this house there is our office bathroom which is a bumped out little room from the major footprint of the house and I have the lantana all the way across that one outside wall. There is nowhere for it to go to get mixed up with other gardens, except that it grows into the grass and I think that's when DH would pile up the vines back at the wall again. I started with several plants just spaced across, a yellow flowering one, a white flowering one, and that beautiful multicolor one. It must be a good space for them to grow because it's very full.
At my old house, I'd put it in a front flower bed but it grew wildly out of control and there were other plants there so I moved it to along a wooden fence where it stayed more tidy because there was less sun in that spot. I never had to prune it there. It didn't bloom much in that spot either. But I didn't have any problem with the roots when I dug it out of the front garden.
I suppose I'm not taking care of it properly, but there's a lot of color and it doesn't die in drought and I didn't cover it the one day we thought it might be freezing and it did just fine through all that. Any plant that can survive my inattention is a winner in my book!
I've resolved to do what I can to amend the soil in my veggie garden and see if I can get more produce. I tried to do a compost bin one time and never could get it to turn into anything but a gloppy mess so gave up on that. I never wanted to leave it out in the open where I could turn it because I'd likely have raccoons, rats, mice, who-knows-what-else coming around. Yes, Armadillos, moles, snakes, yikes!