Reproducible outages in EPG in part of DVB-T multiplex

[Poutnik]

Hello, I have recently switched from analog TV device to DVB-T one, as far analog TV is being turned off gradually in my country.
I have noticed at one of program multiplex, that 2 of multiplex programs have very big holes in EPG program list items.
These holes are totally reproducible, i.e if I delete EPG list and reload it, I got the exactly same result as before.
Software shows at signal level indicator full signal level, with no visible disturbances in signal quality.

Could it be caused by signal errors ? I ask because of I would guess signall errors as random phenomena should cause random EPG list outages.

I use Leadtek DTV DONGLE GOLD - USB2, with Winfast PVR2 software ( both SW and drivers as last versions ).
I live in big city with local DVB-T broadcasting. I use room active antenne with 35-40 dB gain.