Rob Kardashian lashed out at Blac Chyna in another round of their nasty lawsuit battle but his “erratic” behavior was no surprise to his estranged baby mama, RadarOnline.com exclusively learned.<br /><br />“Rob has been manic lately,” a source close to Kris Jenner’s only son told Radar. He skipped his mother’s Christmas Eve party and was hiding in his house over the holidays.<br /><br />filed another round of vicious court documents against Chyna, 29, and the insider told Radar that his relationship with his baby mama had deteriorated.<br /><br />“Rob has been so erratic in his communication with Chyna lately,” the source snitched. “He vacillates from normal conversations about drop-off for Dream to begging Chyna to see him and then calling her a bad mom. He seems unstable.”<br /><br />The warring couple were fighting over their canceled reality show, with Chyna claiming Kardashian’s “became media predators, slut-shaming” her when they killed the show after it had already begun filming a second season.<br /><br />PHOTOS: Take Me Back! Rob In Peace Talks With Blac Chyna Amid Nasty Legal Battle</a><br /><br />“Chyna was blindsided by these new court documents,” the insider told Radar. “But she sees the crazy way Rob is acting lately and nothing surprises her.”<br /><br />We pay for juicy info! Do you have a story for RadarOnline.com? Email us at tips@radaronline.com, or call us at (866) ON-RADAR (667-2327) any time, day or night.
