Second SIM loses reception/shows "no signal" randomly, a lot

New phone, every software up to date.

SIM1 is my main/local SIM (Singtel, Singapore). This works fine, otherwise... I couldn't use my phone.

SIM2 is a roaming SIM from Germany (Simyo). This one fails to work 60-70% of the time and seems to reset completely (because if I enable a PIN for the SIM, I will regularly be asked to enter it again). The SIM is fine, works well in every other phone I tried. This isn't a reception problem either, because the roaming partner for Simyo is .. Singtel. As in, when SIM1 has reception, so should SIM2. They're literally using the same network.

Anyone else experiencing SIM issues like these?

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