On Sat, December 19, 2015 16:38, Sunil Kumar U.K. wrote:
[Sat Dec 19 17:52:14.208341 2015] [:error] [pid 10618] [client 10.0.0.158:51891] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 34952537 bytes) in Unknown on line 0
Do these messages appear when you experience the problem? Then be sure to increase the PHP memory_limit setting and restart Apache. Of course make sure that the limit is not higher than your available RAM on the system.
Cheers, Thijs