There is no concept of "bandwidth" from a satellite, at least not for the "bent pipe" transponders Directv satellites use . They send RF signals, all the modulation of digital data into RF happens on the ground for transmission and on the ground again within your receiver for reception. The satellite just receives and amplifies the analog RF signal, and has no clue what data is encoded.
Directv plans to use reverse band (which is just a slightly lower frequency than Ka lo) for 4K eventually, and combine two (or maybe three...not clear yet) transponders together for great efficiency of distributing 4K, but they are successfully delivering 4K using ordinary Ka frequencies and ordinary Ka/Ku (non reverse band) LNBs today.
The "pop" you get is probably HDCP 2.2 negotiation. Not really all that different from TVs switching from say 720p to 1080i which for most isn't instantaneous, which is why TVs usually take a bit longer to switch between channels when in native mode (though newer ones are a lot better than ones 10 years old)