why is my jeep spark plughs going bad

[JeepDxb]

what are the reasons for my spark plugs to go bad so fast.

i had got them changed when my car had completed 100K Km and just after 2 months the check engine light came up after the car was rattling on 40 KMPH so when i got it diagnosed they found out that there were a lot of misfiring and some of the plugs were fowled and needed to be changed which when good for 1 month and again same thing is happening

please help

[JeepDxb]

get the spark plugs inspected to get the exact condition as this will give a good indication as to where the problem may lie

but first thoughts are that it could be a faulty injector which make the plug fuel fouled it could also be a low compression problem or a ignition issue, i would have these items inspected first but first get the plugs checked.

[JeepDxb]

thank you