I have spent hours diagnosing this issue (working with Akai Support). The only solution I have found is to disable Wifi (or disconnect the Ethernet cable) before booting your Force, and keep it that way while using it. If I enable Wifi after booting, or boot with Wifi enabled (or networking enabled using an Ethernet cable) it will deactivate my plugins.
The original poster said, I believe, that the network must remain active for the plugins to remain active. Is that the case, or is it that your plugins are deactivating when you boot the device. I am seeing the later.
The Details...
When I say connected to the Internet below, I mean either connected by WiFi (WiFi enabled), or using an Ethernet cord with Ethernet enabled. I tested both extensively and saw the same results using Wifi or the Ethernet port.
I also ruled out any issues with my network router, DNS, DHCP (obtaining an IP address and router/gateway info), etc. including wondering if my particular router might be slow, have a delay, or be blocking Akai's websites. For example, I did a lot of testing to confirm the Akai wasn't trying to confirm activation before the Force had obtained a working network connection and failing because of an Internet connection issue. As best I can tell, that is not the issue. I believe this is entirely a software issue either on the Force, Akai's servers, or both.
The bug I am seeing is if I boot my Akai Force while it is connected to the Internet, it will immediately deactivate my plugins. I re-activate them and all works fine. In fact, I can reboot or power cycle the Force and they remain activated. But, if I power my Force off for more than 10 minutes and then back on with Internet access enabled (e.g. Wifi enabled), it immediately deactivates my plugins again.
If I disconnect my Force from the Network, and power off for more than 10 minutes, then reboot (again network still off), they remain activated. If I then enable the Network, they are immediately deactivated.
To be clear, the only times my plugins get deactivated is if I boot with the network enabled, or if I enable the network after I have booted with networking disabled. I have never seen them deactivate randomly while using the Force as long as the Wifi or Network is disabled.
I have also booted with networking enabled, had to reactivate my plugins, but then as long as the Force is powered on, it will not deactivate them, allowing me to use the Force and networking without issues.
I did not have this problem with firmware v3.3, but it started when I installed v3.6. I went straight from v3.3 to v3.6. I did not install v3.4 or v3.5 in between. The v3.7 update did not change the behavior.
The last test Akai asked me to do is to run a procedure to back date to the old firmware and then update again to v3.6 (or v3.7), running some special procedure in between to more cleanly wipe my device (or something like that). I haven't had a chance to do that test as it is a little complicated and I haven't gone back to my Force for several weeks now.
I hoped v3.7 might fix things since they completely revamped the activation page for v3.7, but that may have only been a cosmetic change. Too bad they didn't add an "activate all" button. It is getting really old having to tap "activate" for ever single plugin separately.
Thankfully, Akai Support has been very helpful offering suggestions and they did pass my notes to the engineering team.