The most recent of these incidents took place in May when a man tried to break into Abby Lee Miller's dance studio.
According to local media, 34-year-old Joseph McKinstry demanded to be let inside so he could read poetry to the students.
Also disturbing: A Twitter account that reportedly belongs to McKinstry sent out dozens of affectionate tweets to child star Mackenzie Ziegler before his arrest.
See photos of "Dance Moms" star, Abby Lee:
Abby Lee Miller, Dance Moms
Abby Lee Miller, Dance Moms
SANTA MONICA, CA - MAY 30: Dance Instructor Abby Lee Miller attends the Abby Lee Dance Company LA's VIP Grand Opening at Abby Lee Dance Company LA on May 30, 2015 in Santa Monica, California. (Photo by Vincent Sandoval/WireImage)
INGLEWOOD, CA - MARCH 28: TV personality Abby Lee Miller attends Nickelodeon's 28th Annual Kids' Choice Awards held at The Forum on March 28, 2015 in Inglewood, California. (Photo by Jason Merritt/Getty Images)
INGLEWOOD, CA - MARCH 28: TV personalities/dancers JoJo Siwa, Maddie Ziegler, Kalani Hilliker, tv personality Abby Lee Miller and dancer/tv personality Mackenzie Ziegler, accept the Favorite Reality Show Award for 'Dance Moms' onsteage during Nickelodeon's 28th Annual Kids' Choice Awards held at The Forum on March 28, 2015 in Inglewood, California. (Photo by Lester Cohen/KCA2015/WireImage)
SYDNEY, AUSTRALIA - MARCH 12: Abby Lee Miller and Maddie Ziegler arrives at the 2015 ASTRA Awards at the Star on March 12, 2015 in Sydney, Australia. (Photo by Caroline McCredie/Getty Images)
INGLEWOOD, CA - AUGUST 24: TV personality/Choreographer Abby Lee Miller attends the 2014 MTV Video Music Awards at The Forum on August 24, 2014 in Inglewood, California. (Photo by Jeff Kravitz/FilmMagic)
NEW YORK, NY - JULY 16: (L - R) Shad Moss, Abby Lee Miller, Keshia Chante attends 106 & Park at BET studio on July 16, 2014 in New York City. (Photo by Bennett Raglin/BET/Getty Images for BET)
NEW YORK, NY - JULY 16: TV personality Abby Lee Miller visits 106 & Park at BET studio on July 16, 2014 in New York City. (Photo by Bennett Raglin/BET/Getty Images for BET)
RIDGEWOOD, NJ - JULY 15: Abby Lee Miller signs copies Of Her Book 'Everything I Learned About Life, I Learned From Dance Class' at Bookends Bookstore on July 15, 2014 in Ridgewood, New Jersey. (Photo by Jim Spellman/WireImage)
Abby Lee Miller, The FOX Teen Choice Awards 2014 arrivals (Set B) at the Shrine Auditorium in Los Angeles, California. August 10, 2014. (Pictured: Abby Lee Miller)
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And in September 2015, a San Diego man known as Phoenix Sundown tried to send suspicious packages to one of the cast members.
The packages reportedly contained several blankets, a coffee maker, letters and some sexually explicit material.
The unnamed cast member never received the packages — police destroyed them with a water cannon at the post office.