Follow breaks anytime you enter melee combat.
As in swing a weapon, not as in shooting a wand/bow/gun/crossbow.
Follow also breaks, when you use a channeled spell like Arcane Missiles or Penance.

You can set Jamba to strobe after combat.
Which means the addon will spam /follow every second or so, when you're not in combat.
I personally don't like the auto follow, so choose to bind FTL Follow Me to a mouse thumb button and manually press that whenever I want follow including after almost every fight.

Whatever is easier for you to use.