Not much is known about the Bugs other than they show up pretty much everywhere and they don’t like humans very much. Complicating the fight against this relentless threat is the fact that they are telepathic and that the frequency they use disrupts much of the technology humanity relies upon. This is why humans are required to deal with the Bugs in person rather than sending robots to do the job. It also explains why weapons, sensors, and pretty much everything are a bit primitive.
The Bug’s powerful telepathic network not only restricts the tech used to combat them, but it also allows them to track anything that is powered. Since your EXO suits, weapons, and vehicles are all powered there is no hiding from them.
On the bright side, the Bug’s telepathic nature is also their key weakness. A fairly low-tech jammer can synch with an individual Bug spawning nest and effectively shut it down. Unfortunately, jamming requires someone getting very close and staying there long enough to establish a disruptive link.
The war against the Bugs can be won, given enough time and sacrifice. Your sacrifice, most likely!