LinkedIn does changes time to time
I created a new Sales Navigation Profile & t it got banded the next day when i tried to send 20 connection per day, After this I did a little research & came to know about some point which LinkedIn might have made some changes
1. If it is Premium Profile OR Normal Profile your profile might get targeted by LinkedIn New rules
2. After my Sales Navigation Profile Removed, I tried with another account & send only 5 Connection Per Day for 7 Days after 7 Days I increased the connection sending request to 10 Per Day for Next 7 Days. Now I'm sending 20 Connection Request Per Day & Till now no effect to my new profile.
3. Apart from sending connection you should share valuable information on LinkedIn Daily to keep the profile movement in positive side which can reduce the Banned Risk.
I hope this might answer your question, If you need more information just let me know