Immune system issues

I have tried a number of different biologucs (including cosentyx, otezla, tremfya) in the 3 or 4 years. I never suffered from respiratory or any other illnesses until December 2024, at which time i was some months without biologics. I now seem to be constantly sick with usually respiratory viral infections....i have scheduled blood tests to investigate whst appears to be a compromised immune system 3 times but had to cancel due to illness. I had tests done earlier this week even though I'm still not well. I have been such for 4 weeks out of the last 8...no sooner over one bout than get another. I'm just wondering if anyone else has experienced weakened immune system after cessation of biologics.