There is always a market risk. If market performance is poor across the board, this also has an impact on your funds.
The same is true of cluster risk. Some investment funds focus on particular regions, sectors or themes. If these perform poorly, the value of the associated investment funds also falls. If a technology bubble bursts, for example, this has a bigger impact on a fund purely focused on technology than funds containing securities from different sectors. If the SMI slumps, equity funds with a heavy weighting of Swiss securities are hit worse than funds which invest worldwide.
It is advisable to look closely at the exact composition of a fund. Even if you have different funds in your portfolio, they may invest in the same company or region. Such cluster risks are not immediately obvious.