Might not even be 5G interference. What is the CNR on 4032V15201 on 117W when it is decoding reliably? As it is DVB-S 5/6, should decode reliably to approx. 6.5dB C/N. If your CNR doesn't have adequate headroom above 6.5 dB (minimum recommended C/N), other minimal factors may be affecting the reception.
5G interference is usually exhibited as fluctuation of lock/unlock (steady video and sound then microblocking and stuttering audio repeating cycle) as the Forward Error Correction (FEC) attempts to gather enough uncorrupted bits to correct the errors and begin decoding again. I wouldn't expect the CNR just to drop to 0dB and remain.
Try shifting the TP frequency to the published 4031 MHz +/- 1, 2 or 3 MHz. This frequency is very close to the filter bandpass, so the C140 attenuation slope is typically 25db and ramping up near the filter edge.
If this is the result of 5G interference, you might need a tighter filter such as an inline mechanical waveguide on a feedhorn in addition to an 4000-4200 MHz BPF LNB and maybe even build a RF fence to block the source.
