As already mentioned, activating a bastion apparently does this.
As I’ve never flown a marauder yet, my first guess would be command bursts, as these also give you a weapons timer that doesn’t allow you to dock at structures or jump gate even if you’re flying solo.
To avoid it, you can warp to a safe bookmark to wait out your weapons timer, before you warp to the structure to dock up.
If you directly warp to a structure when hostiles appear, they can follow you and tackle and kill you while you were waiting out the timer.
Maurauders are pretty solid. To do decent damage to one when its bastion module is active, requires decent firepower and quite a few pilots. For that decent firepower (not just pew pew) they’ll need a cruiser, of which the marauder has no issues targetting, and will blap the entire fleet within about 8 seconds. If it’s been ewared then just wait for concord and the cap battery wont drain quickly enough from a cruiser, so not really worth the time. It’s just not even worth the time trying. Perhaps a massive trash fleet would do it, but what a compliment it would be that that many people have committed that time and effort to kill you
It’s worth the time in 0.4 or below. It’d be a sitting duck. I reckon about 7 decent bombers would destroy it pretty quickly.
Honestly only if you bling in highsec, so they can make a profit. In low it doesn’t matter, any non-Snuff/Revolution Marauder will generate pings in lowsec.