Arch Linux

Description:
I'm experiencing X.org freezes, especially when using Java apps such as Eclipse or Netbeans, mainly during IO. I experienced this once when using Firefox and a couple of times just after the boot. Using Bumblebee. The freeze may occur 20 secons after a boot or after 3 hours.

Additional info:

nvidia-lts 361.28-3
bumblebee 3.2.1

System: Host: arch Kernel: 4.1.21-1-lts x86_64 (64 bit)
Desktop: Cinnamon 2.8.8 Distro: Arch Linux
Machine: System: ASUSTeK (portable) product: X555LB v: 1.0
Mobo: ASUSTeK model: X555LB v: 1.0
Bios: American Megatrends v: X555LB.204 date: 01/13/2015
CPU: Dual core Intel Core i5-5200U (-HT-MCP-) cache: 3072 KB
clock speeds: max: 2700 MHz 1: 2502 MHz 2: 2637 MHz 3: 2500 MHz
4: 2691 MHz
Graphics: Card-1: Intel Broadwell-U Integrated Graphics
Card-2: NVIDIA GM108M [GeForce 940M]
Display Server: X.Org 1.18.3 driver: intel
Resolution: 1366x768@60.00hz
GLX Renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2)
GLX Version: 3.0 Mesa 11.2.0
Audio: Card-1 Intel Wildcat Point-LP High Definition Audio Controller
driver: snd_hda_intel
Card-2 Intel Broadwell-U Audio Controller driver: snd_hda_intel
Sound: Advanced Linux Sound Architecture v: k4.1.21-1-lts
Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169
IF: enp2s0 state: up speed: 100 Mbps duplex: full
Card-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter
driver: ath9k
IF: wlp3s0 state: down
Drives: HDD Total Size: 128.0GB (23.0% used)
ID-1: /dev/sda model: LITEONIT_LCS size: 128.0GB
Partition: ID-1: / size: 73G used: 24G (35%) fs: ext4 dev: /dev/sda5
ID-2: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sda4
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 150 Uptime: 29 min Memory: 2506.1/7889.2MB
Client: Shell (fish) inxi: 2.2.38

Steps to reproduce:

Opening/closing a file in Eclipse. Launching Netbeans.