RUU, S-On/S-OFF, Radio and Lack of Signal

I there community, i have a HTC One S upgraded to 2.15 Hboot and i need some help choose the best RUU.
My old phone details:
----> Start <----
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.13.0000
(bootloader) version-baseband: 0.16.31501S.17_2
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) serialno: SH24PW******
(bootloader) imei: ***************
(bootloader) product: vle
(bootloader) platform: HBOOT-8960
(bootloader) modelid: PJ4010000
(bootloader) cidnum: HTC__304
(bootloader) battery-status: good
(bootloader) battery-voltage: 3873mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-d92cc658
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.071s
----> End <----
1 Q : Anyone have the most recent radio for HTC One S4 Signed? (The websites of this material are down).
2 Q : After Get S-Off i can back to S-On.
3 Q : I have a problem with signal, sometimes the phone reboots and airplane mode gets stuck , after that, no IMEI, no Baseband Version and no Signal , anyone knows how to fix it without reinstall the ROM (Wipe Dalvik-Cache, Cache...) because i did it some times.

Thank you for your time reading my thread ;)