V box killing lnb's

Had a really strange experience tonight and its been bugging me

Setup: 1.5m gibby - invacom lnb/gibby feedhorn, v box, viark sat 4k

Watching the match tonight and suddenly get a message of 'no signal'

Ok thought my lnb had gone faulty after some investigation, pops on a different lnb 5 mins later bam same thing

Digs through my box of carp and luckily finds another invacom/gibby feedhorn only this time I have bypassed the vbox and everything has been fine (obivously minus no motor)

I...

V box killing lnb's