Help needed topic

Hello everyone! How's it going... I'm a new member but a long tone reader on XDA Devs... Bought a new phone a week ago . it is an LG Optinus G E975... The problem I'm facing is that whenever I'm trying to install certain apps my phone acts weird... It refuses to install those apps saying it has low memory. Please help me out on this... Tried rebooting... Custom installer from market... Tried Google verify and install.. Rooted on clockworkmod V6.

I have 16 gigs of internal memory free (out of 32)