For all the folks saying to clean the dryer, clearly you never fucked with the LG dryers. They do this shit straight off bat.
If you don’t understand timed drys vs auto drys, which half the settings are, sure, you have problems. Most of the LG settings(I have one of their “smart” dryers and washers) are all auto timed. Placing small loads often won’t trip the sensor because there’s little moist material to activate it. Running large loads with the filter clogged will end up having it detect more of the dry lint than the wet center of your blanket. Empty the filter and restart it and you’ll be amazed to see it’ll auto run for another 30 minutes and your clothes come out fine. Or switch to the actually timed dries and it will run the whole time NO MATTER WHAT.
If it’s shutting off that fast, it’s user error.