k30 sensor cleaning

been through a few Pentax cameras over the years, always happy to accept that they needed tlc once a year (or so) to remove the odd speck here and there. So was quite excited to learn that the k30 could at least partially vibrate the occasional bits of dust away from the sensor and maybe keep me content for longer.
I've now sent mine away four times since I bought it at the beginning of last year, I've had it back for just a few weeks now and already there's a beautiful blob just where it shouldn't be!
Is there something wrong with the camera perhaps or is it not being cleaned correctly? or am I doing something fundamentally wrong when I change lenses?
any advice/help welcomed!

The basic things are to change lenses in as dust free an area as feasible, turn off the camera whilst we do so and point the throat of the camera downwards during the process.

This ensures that there's no charge on the sensor to attract dust and less chance of some particle falling into the camera.

A rocket blower is the second stage cleaning process. Operate it a few times before putting it near the camera, to eliminate any dust inside it, and give a few short bursts of air. Don't go anywhere near actually touching the sensor. It's always done the trick for me and I've never had to do a contact clean with pads.

thanks John, but I'm ultra careful now, certainly more so than with any previous cameras and am probably unjustly nervous at trying to blow the dust away myself.
I lifted the mirror last night to have a look but can't even see the offending particle.

Can you post a shot showing the blob please?

Sensor dust is a lot easier to see when magnified with a loupe

This kit might be worth considering, although if you're the type who's nervous about blowing the dust away you're not likely to feel comfortable scraping at the sensor with a pen.

So far all I've needed is a rocket blower. I limit its use because you never know where the sensor dust will go next. I think it probably hangs around in the body. Also, the air from the blower has to come from somewhere. Unless it's a blower with a fine inlet filer you could end up pushing in more dust.

LensPen Sensorklear Loupe Kit

It's probably obvious to you but when looking for the dust remember it will be the other way up on the sensor to the location on your photos! Have you performed a dust alert? The image output by the Dust Alert is in the same orientaion as you view the sensor.

I'd expect two or three puffs with a blower would shift that.

Whilst straight out of the camera JPEG are fine, I do sometimes notice dust blobs when setting fairly extreme levels in PP. It's something I live with.

just invested in a rocket blower...thanks for the guidance I'll give it a go

I have a rocket blower but haven't used it on the sensor yet too scared!